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Functional Descriptions

VMDS-10488 VSC7511 Datasheet Revision 4.2

151

The READ command is 4 bytes wide and consists of one 32-bit address field, which is 32-bit aligned. The

2 least significant bits of the address set to 01. The following illustration shows the request command and

the associated response result.

Figure 49 •

READ Command

3.15.5

VRAP WRITE Command

The WRITE command writes a 32-bit value to any register inside the device.

The WRITE command is 8 bytes wide and consists of one 32-bit address field, which is 32-bit aligned.

The two least significant bits of the address set to 10, followed by one 32-bit write-data field. The

following illustration shows the command.

Figure 50 •

WRITE Command

3.15.6

VRAP READ-MODIFY-WRITE Command

The READ-MODIFY-WRITE command does read/modify/write-back on any 32-bit register inside the

device.

The READ-MODIFY-WRITE command is 12 bytes wide and consists of one 32-bit address field, which is

32-bit aligned. The two least significant bits of the address set to 11 followed by one 32-bit write-data field

followed by one 32-bit overwrite-mask field. For bits set in the overwrite mask, the corresponding bits in

the write data field are written to the register while bits cleared in the overwrite mask are untouched when

writing to the register. The following figure shows the command.

Figure 51 •

READ-MODIFY-WRITE Command

3.15.7

VRAP IDLE Command

The IDLE command does not access registers in the device. Instead it just copies itself (the entire

command) into the VRAP response. This can be used for padding to fulfill the minimum transmission unit

size, or an external CPU can use it to insert a unique code into each VRAP request frame so that it can

separate different replies from each other.

The IDLE command is 4 bytes wide and consists of one 32-bit code word with the four least significant

bits of the code word set to 0000. The following illustration depicts the request command and the

associated response.

Figure 52 •

IDLE Command

Request:

32 bits

Response:

32 bits

Request:

32 bits

Request:

Overwrite mask

32 bits

Any 28-bit value

Request:

32 bits

Copy of value

Response:

0000

32 bits

0000

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