Idle And Set Idle Timer (Fa H ) - Seagate Medalist 1640 Product Manual

Medalist 1640 and 2140 Product Manual, January 1996
Data transfer mechanism
Mechanism name
PIO Transfer Mode (default:
Set PIO Mode = 2)
PIO Transfer Mode:
Set PIO Mode = 2
PIO Flow Control Transfer
Mode: Set PIO Mode = 0
PIO Flow Control Transfer
Mode: Set PIO Mode = 1
PIO Flow Control Transfer
Mode: Set PIO Mode = 2
PIO Flow Control Transfer
Mode: Set PIO Mode = 3
PIO Flow Control Transfer
Mode: Set PIO Mode = 4
Multiword DMA Mode
Multiword DMA Mode
Multiword DMA Mode
Reserved
3.2.3 Idle and Set Idle Timer (FA
This is a Seagate-unique power command. It moves the drive immedi-
ately to Idle mode. When the drive receives this command, it asserts
Busy in the Host Status register, initiates entry into Idle mode, negates
Busy and generates an interrupt. If the drive is in Standby mode, it spins
up to enter Idle mode but does not wait for the spinup to complete before
issuing the interrupt.
The command also allows the host to set a timer, the Idle timer, that
causes the drive to move to Idle mode if no drive activity occurs within
the allotted time. The timer is set using the Sector Count register. The
register values correspond to 100-msec increments with a maximum
programmable time of 25.5 seconds. A zero value in the Sector Count
register disables the timer. If this value is set, the Idle timer is enabled
Transfer types value
Mode Data
value Upper 5 bits
2 00000
2 00000
0 00001
1 00001
2 00001
3 00001
4 00001
0 00100
1 00100
2 00100
---- 01000
)
H
33
Lower 3 bits
000
001
000
001
010
011
100
000
001
010
nnn