Sony SDX-800V/R manual Write Buffer

WRITE BUFFER 6.Command Specification

Parameter List Length: specifies the maximum number of bytes that will be transferred during the Data Out phase. The initiator should attempt to ensure that the Parameter List Length does not exceed the buffer capacity. If this does occur, the drive returns a CHECK CONDITION status with an ILLEGAL REQUEST sense key set. The capacity of the buffer can be determined from the Buffer capacity field in the Read Buffer descriptor. The Parameter List Length must be greater than four (except in data only mode), else the drive will return a CHECK CONDITION status with an ILLEGAL REQUEST sense key set.

Echo Buffer: In this mode the data shall be stored in an echo buffer. Data shall be sent aligned on four-byte boundaries. The BUFFER ID and BUFFER OFFSET fields are ignored in this mode. The drive assigns echo buffer on a per initiator basis. The initiator should attempt to ensure that the parameter list length does not exceed the capacity of the echo buffer. The BUFFER CAPACITY field in the READ BUFFER echo buffer descriptor determines the capacity of the echo buffer. If the PARAMETER LIST LENGTH field exceeds the buffer capacity, the drive will return CHECK CONDITION status with a Request Sense Key of ILLEGAL REQUEST.

SONY AIT-3Ex drive SDX-800V series Ver.1.1 6-109