Board Users Guide

ATA Register Interface
MPC5200B Users Guide, Rev. 1
Freescale Semiconductor 11-13
11.3.3.2 ATA Drive Alternate Status Register—MBAR + 0x3A5C
11.3.3.3 ATA Drive Data Register—MBAR + 0x3A60
Table 11-20. ATA Drive Alternate Status Register
msb 01 23456789101112131415
RBSYDRDY
Reserved DRQ Rsvd ERR Reserved
W
RESET:0 0 000000000 0 00 0 0
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 lsb
R
Reserved
W
RESET:0 0 000000000 0 00 0 0
Bits Name Description
0 BSY Drive Busy—Transactions internal to drive are in progress. Host must wait.
1 DRDY Drive Ready
2:3 — Reserved
4 DRQ Set to 1 indicates drive is ready to transfer a word of data.
5:6 — Reserved
7 ERR Indicates an error during the execution of the previous command.
8:31 — Reserved
Table 11-21. ATA Drive Data Register
msb 012345678 9 101112131415
R Data H Data L
W
RESET:0 00000000 0 0 0 00 0 0
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 lsb
R
Reserved
W
RESET:0 00000000 0 0 0 00 0 0
Bits Name Description
0:7 Data H Upper byte of drive data (read/write)
8:15 Data L Lower byte of drive data (read/write)
16:31 — Reserved