參數(shù)資料
型號: TSB43AA82PGE
廠商: TEXAS INSTRUMENTS INC
元件分類: 微控制器/微處理器
英文描述: 2 CHANNEL(S), 400M bps, SERIAL COMM CONTROLLER, PQFP144
封裝: PLASTIC, QFP-144
文件頁數(shù): 135/146頁
文件大?。?/td> 770K
代理商: TSB43AA82PGE
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
Initiator
Operation
Sphynx
Hardware
Operation
Application
Software
Operation
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
TSB43AA82 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 TSB43AA82 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
TSB43AA82 automatically sends a block read request for the command agent ORB through the CTQ. If the address
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