参数资料
型号: TSB43AA82PGE
厂商: TEXAS INSTRUMENTS INC
元件分类: 微控制器/微处理器
英文描述: 2 CHANNEL(S), 400M bps, SERIAL COMM CONTROLLER, PQFP144
封装: PLASTIC, QFP-144
文件页数: 137/146页
文件大小: 770K
代理商: TSB43AA82PGE
78
of the ORB in next_ORB or ORB_offset is a dummy, agent state of aimed agent is suspended and no request is
transmitted. The size of the block read request is defined by the logical unit characteristics of the target ConfigROM.
The host needs to keep this size and the CORB_size of ORB fetch control register (44h) consistent. For a SCSI
device, this is 8 quadlets. Figure 7-4 shows a typical link fetch.
After TSB43AA82 sends the block read request and receives its block read response, COREnd on Interrupt (0Ch)
is set to 1 to inform the host.
8-Byte Block Write Request
AgntWr_Int
CAgQRdy = 1
Notify that MANAGEMENT_ORB
Is Ready. The Contents of Packet Is
Command Block ORB Offset Address.
Target
Initiator
ORB_POINTER Register
Prerequisites:
CAgVld (44h) Is ON
Block Read Request
COAF_Agent and CTQ
Command Block ORB Offset Address
Block Read Response
CRF
COREnd_Int
Host Reads Out CRF
CAgQRdy = 1
Command ORB
Block Read Request
Next ORB Address
Command ORB Response.
Contents of Packet Is Linked
Command ORB.
COAF_Agent and CTQ
Block Read Response
CRF
COREnd_Int
Command ORB
Command ORB Response.
Contents of Packet Is Linked
Command ORB.
Status Block Write
(Repeat Until the End of Link)
.
Figure 75. Typical Link Fetch
7.3.2.2 Suspend Link FETCH
To suspend the command agent, clear the CnxFtEn bit in ORB fetch control register (44h). This turns off the command
agent autoresponse to a received command ORB. The received ORB packet is stored in the CRF without sending
a request, even with an effective link address. The process to reconnect a fetch is explained in Section 7.3.2.6.
The timer transmits after it confirms that available free space in the CFR is large enough to store a response to its
read request. Thus the host can control the transmit interval by preadjusting the CFR size and reading from the CFR.
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