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Command Specifications
264 C141-C013
Table 4.60 WRITE BUFFER transfer mode
"Mode Bit" 3 2 1 0 Transfer Mode
0 0 0 0 Header + Data, without Address Specification
0 0 0 1 Header + Data, with Address Specification
0 0 1 0 Data Only, with Address Specification
0 1 0 0 Microcode Download, without Saving
0 1 0 1 Microcode Download, with Saving
0 1 1 0 Microcode Download with offset, without Saving
0 1 1 1 Microcode Download with offset, and Saving
1 0 1 0 Echo buffer
(1) Mode = 0, 0, 0, 0: Header + data, without address specification
In this mode, a 4-byte header (with all zero's specified for the contents) must be
added to the top of the data transferred from the INIT. Also, zero must be
specified in the "Buffer address" field of the CDB.
The "Transfer byte length" field specifies the total number of bytes of data
transferred form the INIT. The transfer byte count specification includes the 4
bytes of the header. The HDD stores the data transferred from the INIT with the
header omitted ("Transfer byte length" – 4 bytes) in the data buffer beginning in
order from the top of the data buffer (Address: X '000000').
Furthermore, a value which is less than the [HDD's buffer size + 4 bytes] must be
specified in the "Transfer byte length" field in the CDB. When a value that is
larger than this is specified, no data transfer with the INIT is executed. Also,
when zero is specified in the "Transfer byte length" field, this command is
terminated without data being transferred.
Table 4.61 lists the format of data transferred from the INIT when this mode is
specified.