參數(shù)資料
型號: TSB43AA82A1
廠商: Texas Instruments, Inc.
英文描述: 1394 integrated PHY and link layer controller(1394集成PHY和鏈路層控制器)
中文描述: 1394綜合物理層和鏈路層控制器(1394集成物理層和鏈路層控制器)
文件頁數(shù): 89/146頁
文件大?。?/td> 597K
代理商: TSB43AA82A1
77
7.3
SBP-2 Linked Command ORBs
7.3.1
Typical Command ORB Fetch Command Operation
AGENT_STATE is DEAD
Send Command Block ORB
by Read Response Packet
Split Time-Out or
Other Error Happened
No
Yes
No
Yes
CRFClr is Set to 1
Start Split Timer
Block Read Request to
Initiator’s Command ORB
Update ORB_POINTER by
8-Byte Write Request Packet
Pointer or Doorbell
No
Yes
Next ORB_POINTER
is NULL POINTER
No
I
S
A
Set CAgXrdy to 1 When Agent X Is Ready to Fetch the Next Command Block ORB
Set AGENT_RESET to 1
Yes
Start
7.3.2
SBP-2/Linked Command ORB Procedure
TSB43AA82A has a built-in command ORB fetch agent state machine, which processes up to four agents (LOGINs)
within the hardware. This hardware engine fetches command ORBs, and autoresponds to AGENT_STATE register,
ORB_POINTER register, DOORBELL register, and UNSOLICITED_STATUS_ENABLE register requests and
updates. Commands and linked commands are fetched through the command ORB fetch agent state. This section
describes examples of how the TSB43AA82A processes a linked command.
7.3.2.1 Link FETCH
At login, the target provides the ORB pointer register address to the initiator. The initiator indicates to the target that
a command request is there for it with an 8-byte block write to the ORB_POINTER register (see Section 7.1.1). The
TSB43AA82A automatically sends a block read request for the command agent ORB through the CTQ. If the address
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