1、I ANSI INCITS 332-1999/AMI-2003 supplement to ANSI INCITS 332-1 999 (formerly ANSI NCITS 332-1 999) for Information Technology - Fibre Channel Arbitrated Loop Amendment 1 (FC-AL-2) ANSI INCITS 332-1999/AM1-2003 supplement to ANSI INCITS 332-1999 (formerly ANSI NCITS 332-1 999) f for Information Tech
2、nology - Fibre Channel Arbitrated Loop Amendment 1 (FC-AL-2) Approved April 7, 2003 Secretariat: Information Technology Industry Council 1 Page 1 of 42 pages Amendments to ANSI INCITS 332-1999 (All changes in the replacement pages that follow are marked with change bars in the margins) On all pages:
3、 In clause 3: In 5.1.1: In Table 5: Figures 12 and 14. In Annex Q: (1) Removed ERR-INIT since it is no longer necessary to support this feature. (2) Modified all initialization state diagrams and associated text to remove ERR-INIT recovery. (3) Modified ARB-PEND to be set to TRUE(1) whenever the por
4、t begins arbitrating; not when the port has transmitted an ARB(x). (4) Modified ARB-PEND to be set to TRUE(1) when an L-Port begins arbitrating in the OPENED, XMITTED CLOSE, and RECEIVED CLOSE states to avoid missing this fairness window. Changed description of L-Port to include Public and Private N
5、L-Ports from: 3.1.18 L-Port: Either an FL-Port or an NL-Port as defined in ANSI INCITS, FC-PH-x, 3.1. to 3.1 .I8 L-Port: Either an FL-Port or a Public or Private NL-Port as defined in ANSI INCITS, FC-PH-X, 3.1. Added note to 5.1 .I to explain the ramifications of adding a new FL-Port to an existing
6、Loop with an active FL-Port. Corrected misaligned table entry. Updated . Changed the last line of the second-to-last paragraph to match the state diagrams. Sen- tence was changed from: If Switch Port X recognizes OLS during Loop Initialization, it transitions to the OLD-PORT state after expire(2xALT
7、IME) and completes the Link Initialization. to: If Switch Port X in the NORMAL-INITIALIZE state does not receive LIP before expire(3xAL_TIME), it transitions to the OLD-PORT state and completes the Link Initializa- tion. An American National Standard implies a consensus of those substantially concer
8、ned with its scope and provisions. An American National Standard is intended as a guide to aid the manufacturer, the consumer, and the general public. The existence of an American National Stan- dard does not in any respect preclude anyone, whether he has approved the standard or not, from manufactu
9、ring, marketing, purchasing, or using products, processes, or procedures not conforming to the standard. American National Standards are subject to periodic review and users are cautioned to obtain the latest editions. The American National Standards Institute does not develop standards and will in
10、no circumstances give an interpretation of any American National Standard. Moreover, no person shall have the right or authority to issue an interpretation of an American National Standard in the name of the American National Standards Institute. CAUTION NOTICE: This American National Standard may b
11、e revised or withdrawn at any time. The procedures of the American National Standards Institute require that action be taken to reaffirm, revise, or withdraw this standard no later than five years from the date of approval. Purchasers of American National Standards may receive current information on
12、 all standards by calling or writing the American National Standards Institute. Copyright O 2003 by Information Technology Industry Council (ITI) 3 Definitions and conventions 3.1 Definitions For the purpose of this standard, the definitions in clause 3 of ANSI X3, FC-PH-x and the following definiti
13、ons apply. Definitions in this clause take precedence over any definitions in ANSI X3, FC-PH-x. 3.1.1 3.1.2 3.1.3 3.1.4 3.1.5 3.1.6 3.1.7 3.1.8 3.1.9 Arbitrated Loop: A Fibre Channel topology where Ports use arbitration to gain access to the Loop. Arbitrated Loop Physical Address (AL-PA): A unique o
14、ne-byte valid value as established in 5.1 Arbitrated Loop Destination Address (AL-PD): The Arbitrated Loop Physical Address of the L-Port on the Loop that should receive the Primitive Signal or Primitive Sequence. For example, the AL-PD is the y value of the OPNyx or OPNyy Primitive Signal. Arbitrat
15、ed Loop Source Address (AL-PS): The Arbitrated Loop Physical Address of the L-Port on the Loop that transmitted the Primitive Signal or Primitive Sequence. For example, the AL-PS is the x value of the OPNyx Primitive Signal. close: A procedure used by an L-Port to terminate a Loop circuit. current F
16、ill Word: The Fill Word currently selected by the LPSM to be transmitted when needed. The initial value is the Idle Primitive Signal (see 8.4). Dynamic Half-Duplex: A procedure initiated by the L-Port in the OPEN state to change a full-duplex transfer to a half-duplex transfer. The resulting half-du
17、plex transfer is from the L-Port in the OPENED state to the L-Port in the OPEN state (see 7.5 and annex C). fairness window: the period during which a fair L-Port can arbitrate and win access to the Loop only once (see 4.3). Fill Word: A Transmission Word which is an Idle or an ARByx Primitive Signa
18、l. These words are transmitted between frames, Primitive Signals, and Primitive Sequences to keep a fibre active (see ANSI X3, FC-PH-x, clause 17). 3.1.10 FL-Port: An F-Port (.e., Fabric Port) which contains the Loop Port State Machine defined by this document. 3.1 .I 1 FlNL-Port: An NL-Port that de
19、tects OPN(O0,x) and provides Fibre Channel services in the absence of an FL-Port. 3.1.12 full-duplex: Communication model 2 referred to as duplex in ANSI X3, FC-PH-x. Both L-Ports are allowed to transmit and receive Data frames. 3.1 .I3 half-duplex: Communication model 1 in ANSI X3, FC-PH-x. Only on
20、e L-Port is allowed to transmit Data frames. 3.1.14 Hub: a device for interconnecting L-Ports. 3.1.15 Loop: The Arbitrated Loop described in this document. 3.1 .I 6 Loop circuit: A bidirectional path that allows communication between two L-Ports on the same Loop. 3.1 .I 7 Loop Failure: Loss of word
21、synchronization for greater than R-T-TOV; or loss of signal (see ANSI X3, FC-PH-x, 16.4.2). 3.1.18 L-Port: Either an FL-Port or a Public or Private NL-Port as defined in ANSI INCITS, FC-PH-x, 3.1 ANSI INCITS 332-1999/AM1-2003 3 The words, recognize, recognizes, or recognized, when used in this stand
22、ard, indicates that an L-Port has detected a Primitive Signal or Primitive Sequence. Each individual entry that appears within parentheses of FC-AL Ordered Sets (e.g., ARByx and OPNy) represents the hexadecimal value of an AL-PA or special flags (e.g., hex F7, hex F8, and hex FF). All history variab
23、les, when used in this standard, are assumed to be set to zero (O) at power-on time. Any optional history variable that is not implemented tests as zero (O) in all tests of that variable. The IS0 convention of numbering is used; .e., the thousands and higher multiples are separated by a space and a
24、comma is used instead of the decimal point (e.g., 1 062,5 Mbits/sec). Whenever ANSI X3, FC-PH-x is referenced, all ANSI X3, FC-PH documents referenced in clause 2 are implied. 3.3 Abbreviations, acronyms, and other special words ACCESS AL-PA AL-PD AL-PS AL-TIME ARB-PEN D ARB-WON ARB (AL- PA) ARB(va1
25、) ARByx ARBf-SENT Available-BB-Credit BB-C redit BYPASS CLS CFW DHD Access history variable - a two-valued variable (.e., 0/1) to indicate access fairness history (see 8.1 .I). Arbitrated Loop Physical Address (see 5.1) Arbitrated Loop Destination Physical Address (e.g., the y value in OPNyx and OPN
26、yy) Arbitrated Loop Source Physical Address (e.g., the x value in OPNyx) Arbitrated Loop timeout value (see 8.2.2) Arbitration PENDing history variable - a two-valued variable (.e., 0/1) to help an L-Port remember that it was arbitrating. I Arbitration Won history variable - a two-valued variable (.
27、e., 0/1) to remember whether the L-Port won arbitration (see 8.1 .I). Arbitrate Primitive Signal - an ARByx in which y = x = AL-PA of the L-Port (see 7.1 .I) Arbitrate Primitive Signal - an ARByx in which y = x = val (val represents a one byte hexadecimal value). Arbitrate Primitive Signal - any Ord
28、ered Set that begins with K28.5, D20.4 (y and XI may be used in adjacent text to denote the value of characters 3 and 4 within the Ordered Set) (see 7.1). Arbitrate hex FF Sent history variable - a two-valued variable (.e., 0/1) that indicates that the L-Port has requested REQ(arbitrate (FF) and the
29、 LPSM has modified the current Fill Word to ARB(FF) (see 8.1.7 and 8.4.3). Available Buffer-to-Buffer Credit (see 8.3.4) Buffer-to-Buffer Credit as established during Login (see 8.3.4 and ANSI X3, FC-PH-x, 26.5.2) BYPASS history variable - a two-valued variable (.e., 0/1) which indicates whether an
30、L-Port is bypassed (see 8.1.4). CLoSe Primitive Signal (see 7.4) Current Fill Word (.e., Idle or ARByx) (see 3.1.10 and 7.1) Dynamic Half-Duplex Primitive Signal (see 7.5) ANSI INCITS 332-1999/AM1-2003 5 DHD-RCV DUPLEX E E-Credit LIFA LIHA LILP LIM LIP LIPfx LIPA LIPyx LIRP LISA LISM LI-FL LI-ID LP-
31、TOV LPB LPBfx LPByx LPE LPEfx LPEyx LPSM MRKtx MK-TP 6 Dynamic Half-Duplex Received history variable - a two valued variable (.e., 0/1) to indicate that the L-Port in the OPENED state has detected and supports DHD (see 8.1 5). DUPLEX history variable - a two-valued variable (.e., 0/1) to indicate wh
32、ether the L-Port is allowed to originate Data frames (see 8.1.2). End-to-End Credit (see ANSI X3, FC-PH-x, 26.4.4) Loop Initialization Fabric Assigned - Loop Initialization Sequence (see 10.5) Loop Initialization Hard Assigned - Loop Initialization Sequence (see 10.5) Loop Initialization Loop Positi
33、on - Loop Initialization Sequence (see 10.5) Loop Initialization Master - the L-Port which is responsible for initializing the Loop (see clause 10) Loop Initialization Primitive Sequence - any of the LIP Primitive Sequences (see 7.8) Loop Initialization Primitive Sequence - perform a vendor unique r
34、eset of all (except AL-PA = x) L-Ports (f = hex FF) (see 7.8.5) Loop Initialization Previously Acquired - Loop Initialization Sequence (see 10.5) Loop Initialization Primitive Sequence - perform a vendor unique reset of an L-Port at AL-PA = y (see 7.8.5) Loop Initialization Report Position - Loop In
35、itialization Sequence (see 10.5) Loop Initialization Soft Assigned - Loop Initialization Sequence (see 10.5) Loop Initialization Select Master - Loop Initialization Sequence (see 10.5) Loop Initialization FLag - Loop Initialization flag (see 10.5) Loop Initialization IDentifier - Loop Initialization
36、 identifier (see 10.5) LOOP TimeOut Value (see 8.2.3) Loop Port Bypass Primitive Sequence - either LPByx or LPBfx (f = hex FF) (see 7.7.1 and 7.7.2) Loop Port Bypass Primitive Sequence - used to bypass all (except AL-PA = x) L-Ports (f = hex FF) (see 7.7.2) Loop Port Bypass Primitive Sequence - used
37、 to bypass an L-Port at y = AL-PA (see 7.7.1) Loop Port Enable Primitive Sequence - either LPEyx or LPEfx (see 7.7.3 and 7.7.4) Loop Port Enable Primitive Sequence - used to enable all bypassed L-Ports (f = hex FF) (see 7.7.4) Loop Port Enable Primitive Sequence - used to enable a bypassed L-Port at
38、 y = AL-PA (see 7.7.3) Loop Port State Machine (see 8.4) Mark Primitive Signal (see 7.6) Mark Type - used to identify the type of Mark Primitive Signal (see 7.6) ANSI INCITS 332-1 999/AM1-2003 OPNr OPNfr OPNy OPNyr OPNyx OPNyy PARTICIPATE REPEAT REPLICATE SOFiL XM IT-2-1 DLES Open Replicate Primitiv
39、e Signal - either OPNyr or OPNfr (see 7.3) Open Primitive Signal - broadcast replicate(see 7.3.2) Open Primitive Signal - either OPNyx or OPNyy (see 7.2) Open Primitive Signal - selective replicate(see 7.3.1) Open Primitive Signal - full-duplex (see 7.2.1) Open Primitive Signal - half-duplex (see 7.
40、2.2) PARTICIPATE history variable -a two-valued variable (.e., 0/1) that indicates whether an L-Port has an AL-PA and is participating on the Loop (see 8.1.4). A symbol whose value is derived from BYPASS and PARTICIPATE, which indicates that an L-Port merely repeats received Transmission Words (see
41、8.1.4). Replicate history variable -a two valued variable (.e., 0/1) to indicate if an L-Port has transmitted OPNr while in the OPEN state or an NL-Port has received OPNr while in the MONITORING or ARBITRATING states (see 8.1.3). Start-of-Frame Primitive Signal (K28.5 D21.5 D22.2 D22.2) used during
42、Loop Initialization (see 10.5). Xmit 2 Idles history variable - a two-valued variable (.e., 0/1) that indicates whether the L-Port needs to transmit two (2) Idles (see 8.1 .I). 3.4 Symbols Logic symbols are represented in state tables and diagrams as follows: - the logical or is represented as I; -
43、the logical and is represented as - the logical negation is represented as I- (tilda); - the less-than is represented as cl; - the greater-than is represented as I; - comparisons are represented as =I (equal) and IC (not equal); - setting a variable is done using the colon equal operator, :=I; and,
44、- the concatenation symbol is represented as II. ANSI INCITS 332-1999/AM1-2003 7 5.1 .I Valid AL-PAS The following valid AL-PAs are assigned to the first 127 neutral disparity values from table 1 : hex 00: (1) AL-PA for FL-Port or alias AL-PA of F/NL-Port Highest priority. AL-PA hex 00 shall be assi
45、gned to the FL-Port in the Participating mode. The maximum number of FL-Ports in the Participating mode on a single Loop shall not exceed one. Additional FL-Ports may be present, but they shall be in the Non-Participating or Non-Participating Bypassed mode. NOTE - Adding a new FL-Port to a loop with
46、 an existing FL-Port, may cause the access to the ports on that loop to change to the new FL-Port and the fabric that it is a part of, including possible changes in address for the ports on the loop. If the fabric that the two FL-Ports are part of is not the same, this may impact access to the ports
47、 on the loop from the fabric. If there is no Participating FL-Port on the Loop, a Participating NL-Port may accept this value as an alias AL-PA for its LPSM, but not as its only AL-PA. hex 01 through hex EF: (126) AL-PA for NL-Ports Descending priority is assigned as AL-PA values increase in the ran
48、ge from hex 01 through hex EF. All valid values in this range are lower in priority than hex 00. Each Participating NL-Port shall be assigned one valid AL-PA in this range. The maximum number of Participating NL-Ports on a single Loop shall not exceed 126. 5.1.2 Special AL-PAS and flags The followin
49、g special AL-PAs and flags are assigned to the last 7 neutral disparity values from table 1. These values replace an AL-PA to provide special functions: hex FO: (1) Value used in ARB for fairness and during Loop Initialization. Value hex FO is the next lower priority outside the range hex 00 through hex EF. hex FI through hex F6: (O) Reserved hex F7: (1) Value used in LIP to indicate that the L-Port is initializing and also a value for an L-Port which does not have an AL-PA. hex F8: (1) Value used in LIP to
