Freescale Semiconductor MPC5200B User Manual page 390

Table 11-34. ATA Controller External Connections (continued)
Pin#
20
2 DMARQ
22
23 DIOW:STOP
24
25 DIOR:HDMARDY:HSTROBE
26
27 IORDY:DDMARDY:DSTROBE
28
29
30
31
32 Reserved
33
34
35
36
37
38
39
40
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
Freescale Semiconductor
Cable I/O
KEY —
I
GND —
O
GND —
O
GND —
I
CSEL —
DMACK O
GND —
INTRQ I
—
DA[1] O
PDIAG —
DA[0] O
DA[2] O
CS[0] O
CS[1] O
DASP —
GND —
MPC5200B Users Guide, Rev. 1
System Board
No Signal:Alignment key
DMARQ:DMA Request
—
DIOW
—
DIOR
—
IORDY
NC
DMACK
—
INTRQ
—
DA[1]:Address Bus Bit1
NC
DA[0]:Address Bus Bit0
DA[2]:Address Bus Bit2
CS[1]FX:Chip Select 0
CS[3]FX:Chip Select 1
NC
—
NOTE
ATA Interface Description
I/O MPC5200B
— —
I ATA_DRQ
— —
O ATA_IOW
— —
O ATA_IOR
— —
I ATA_IOCHRDY
— —
O ATA_DACK
— —
I ATA_INTRQ
— —
O ATA_SA[1]
— —
O ATA_SA[0]
O ATA_SA[2]
O ATA_CS[1]FX(CS[4])
O ATA_CS[3]FX(CS[5])
— —
— —
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