K6602743
Rev.2
02.12.’02
- 49 -
Table 6.8 Transfer mode code definition
SC Transfer
Mode
2Xh
Multi-Word DMA Mode (X: 0, 1, 2):
Mode 0: 4.1 MB/sec
Mode 1: 13.3 MB/sec
Mode 2: 16.6 MB/sec
4Xh
Ultra DMA Mode (X: 0, 1, 2, 3, 4, 5):
Mode 0: 16.6 MB/sec
Mode 1: 25.0 MB/sec
Mode 2: 33.3 MB/sec
Mode 3: 44.4 MB/sec
Mode 4: 66.6 MB/sec
Mode 5: 100.0 MB/sec
SC = Sector Count Register
6.3.2.5.6 Set Multiple Mode [C6h]
This command allows the device to specify the number of sectors per block to perform Read Multiple and
Write Multiple operations. The Sector Count Register is loaded with the number of sectors per block. Block
sizes of 2, 4, 8, and 16 sectors are supported. Upon receipt of the command, the device sets BSY=1 and
checks the Sector Count Register. If the Sector Count Register contains a valid value, then the value is
loaded for all subsequent Multiple commands and execution of those commands is enabled. If an invalid
value is specified, an Aborted Command error is posted and execution of the Multiple commands is disabled.
The Multiple commands cannot be executed in the default mode at power on or after a hardware reset.
6.3.2.5.7 Execute device diagnostic [90h]
This command allows the device to perform a self-diagnostics. When DRV0 and DRV1 are connected in the
daisy chain mode, this command is executed for both of the devices. When the device receives this
command, it sets BSY=1 and executes the self-diagnostic operation. Then the device registers the
diagnostic result in the Error register, clears BSY, and generates an interrupt.
Table 6.9 Diagnostic Codes
Code Contents
01
No Error
02
Controller error
03
Sector buffer error
05
CPU error
8X
DRV1 error
