Freescale Semiconductor MPC5200B User Manual
Page 390
ATA Interface Description
MPC5200B Users Guide, Rev. 1
Freescale Semiconductor
11-25
NOTE
MPC5200B provides the ATA_ISOLATION output signal. This signal is shared with the A22 output
of the LocalPlus Most/Graphics mode.
The ATA_ISOLATION is not a signal defined by the ATA Standard. It is provided to support an external ATA transceiver. ATA_ISOLATION
is an active high signal to control external transceiver devices and to ‘isolate’ the ATA bus from the LocalPlus (shared) bus.
It can force the transceiver direction "MPC5200B -> disk drive". Only during an ATA read is this signal allowed to go low, forcing tranceiver
direction "disk drive ->MPC5200B".
The ATA_ISOLATION should be connected to the Direction input of the transceiver.
•
High = Write to drive
•
Low = Read from drive
20
KEY
—
No Signal:Alignment key
—
—
2
DMARQ
I
DMARQ:DMA Request
I
ATA_DRQ
22
GND
—
—
—
—
23
DIOW:STOP
O
DIOW
O
ATA_IOW
24
GND
—
—
—
—
25
DIOR:HDMARDY:HSTROBE
O
DIOR
O
ATA_IOR
26
GND
—
—
—
—
27
IORDY:DDMARDY:DSTROBE
I
IORDY
I
ATA_IOCHRDY
28
CSEL
—
NC
—
—
29
DMACK
O
DMACK
O
ATA_DACK
30
GND
—
—
—
—
31
INTRQ
I
INTRQ
I
ATA_INTRQ
32
Reserved
—
—
—
—
33
DA[1]
O
DA[1]:Address Bus Bit1
O
ATA_SA[1]
34
PDIAG
—
NC
—
—
35
DA[0]
O
DA[0]:Address Bus Bit0
O
ATA_SA[0]
36
DA[2]
O
DA[2]:Address Bus Bit2
O
ATA_SA[2]
37
CS[0]
O
CS[1]FX:Chip Select 0
O
ATA_CS[1]FX(CS[4])
38
CS[1]
O
CS[3]FX:Chip Select 1
O
ATA_CS[3]FX(CS[5])
39
DASP
—
NC
—
—
40
GND
—
—
—
—
Table 11-34. ATA Controller External Connections (continued)
Pin#
Cable
I/O
System Board
I/O
MPC5200B