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)： 138/146頁
文件大?。?/td> 770K
代理商： TSB43AA82PGE
79
7.3.2.3 Link Abort and DEAD State
The host can change the command agent to the DEAD state. For example, when a task is aborted for some reason,
the command agent changes to a DEAD state. For more details, please refer to the SBP-2 standard. Setting Dead(n)
in the agent status register (5Ch) changes the state of the command agent into a DEAD state. Read requests
addressed to agent state from the initiator are automatically responded to with a DEAD state.
Quadlet write requests to the AGENT_RESET register (see Section 7.1.1) by the initiator allow the command agent
to recover from a DEAD state. This resets the command agent and changes the state back to IDLE.
7.3.2.4 SBP-2/Doorbell
The transaction for a write to the DOORBELL register (see Section 7.1.1) is explained below:
The TSB43AA82 agent is in suspended state when the ORB address shown in next_ORB or ORB_offset
shows dummy ORB (FFFF FFFF FFFF FFFFh). The initiator activates the command agent by transmitting
a quadlet write request to the DOORBELL register (see Section 7.1.1). When the quadlet write request is
received at the DOORBELL register by the command agent, DrBell(n) in the agent status register (5Ch) is
set to 1. When necessary, the host sets DrBClr(n) to 1 to clear DrBell(n). Figure 76 shows a typical
suspended and doorbell request.
NOTE: The host cannot activate a suspended agent.
Quadlet Write Request
AgntWr_Int
DrBllx
COAF_Agent and CTQ
Notify Command ORB has
Effective Next ORB Address.
Target
Initiator
DOORBELL Register
Block Read Request
Dummy ORB Offset Address
Block Read Response
Command Agent
No Packet in CRF
CAgXRdy = 1 (When
Next ORB Exists)
Dummy ORB
Block Read Request
Command Block ORB Offset Address
Dummy ORB Response.
Contents of Packet Is Linked
Command ORB.
CRF
COREnd_Int
Clear DOORBELL (See Note 1)
Host Reads Out CRF
Command ORB
Status Block
Command ORB Response.
Contents of Packet Is Linked
Command ORB.
NOTE 1: The DOORBELL register can be cleared by setting DrBClr(n).
Figure 76. SUSPENDED and DOORBELL Request by Dummy ORB
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