关于C6670 SPn_LM_RESP寄存器

你好！我发现有一个SPn_LM_RQ寄存器，其中的command位描述显示：当command写入11时才会发出link request，是否是我自己要写？我的代码中并未对此寄存器进行编辑，是不是如果代��不写这个寄存器的话就不会触发link request，也就不会有相应的link response?谢谢

我在SRIO测试例子中有一段子程序是关于用RQ和RESP和AckID测试连接的，实在没看懂。。能不能说说这段子程序是啥意思。。代码如下

void ackID_sync (CSL_SrioHandle hSrio)

{

   CSL_SrioPortData    responseSrio;

Uint32              count, response, ackID, response_valid;

volatile Int32 LSUNO = SELECTED_LSU;

Uint32 rcvAddress;

Uint32 partner_inbound_ackid;

   CSL_SrioLsuCompStat completionCode;

   CSL_DevRegs*        devRegs = (CSL_DevRegs*)CSL_DEV_REGS;

response_valid = 0;

while (!response_valid)

{

/***** Send Link Request Control Symbols *****/

hSrio->regs->PORT[SRIO_PORT_NUMBER].SP_LM_REQ = 0x04;

for (count=0; count<1000; count++)

asm(" nop 5");

response = hSrio->regs->PORT[SRIO_PORT_NUMBER].SP_LM_RESP;

printf ("Response = 0x%08x\n", response);

response_valid = (response & 0x80000000) >> 31;

}

ackID = (response & 0x3E0) >> 5;

/***** Copy the expected INBOUND_ACKID sent by other device into OUTBOUND_ACKID *****/

hSrio->regs->PORT[SRIO_PORT_NUMBER].SP_ACKID_STAT = (hSrio->regs->PORT[SRIO_PORT_NUMBER].SP_ACKID_STAT & 0xFFFFFFE0) | ackID;

/***** Send Maintenance packet to link partner to set his OUTBOUND/INBOUND ACKID  *****/

/***Value written should be: outstanding = outbound = DSP抯 expected inbound ACKID

value, and the inbound = 1 + ACKID from the LM response above***/

   /* Write the Inbound AckID */

partner_inbound_ackid = ackID + 1;

if(CSL_FEXT(devRegs->DEVSTAT, DEV_DEVSTAT_LENDIAN) == 0)

   partner_inbound_ackid = partner_inbound_ackid << 24;

/* SPn_ACKID_STAT register offset is 0x1148+0x20*n. When we are writing the Maintenance packet which

* will not reach to the logical layer but will be addressed at physical layer, we need to remove

* 0x1000 offset since in actual physical layer the registers are starting from address offset 0x000 */

rcvAddress = 0x00000148 + 0x20 * SRIO_PORT_NUMBER;

srio_start_maintenance(hSrio, (int) &partner_inbound_ackid,(int) rcvAddress, 4, REQ_MAINT_WR, SRIO_PORT_NUMBER, LSUNO);

   responseSrio.index = LSUNO;

   while (1)

   {

       /* Poll and check if the LSU has completed */

       CSL_srioGetHwStatus (hSrio, CSL_SRIO_QUERY_LSU_BSY_STAT, &responseSrio);

       /* Is the LSU not busy */

       if (responseSrio.data == 0)

           break;

   }

   /* Get the completion Code for the specific LSU. */

   completionCode.lsuNum = LSUNO;

   CSL_srioLsuCompCodeStat(hSrio, &completionCode);

   if (completionCode.lsuCompCode != 0x0)

   {

       /* Failed Transfer. */

       printf ("Error: Maintenance has a completion code of %d\n", completionCode.lsuCompCode);

       return;

   }

printf ("Partner_Inbound_AckID = 0x%08x\n", partner_inbound_ackid);

}