Freescale Semiconductor MPC5200, Примечание к применению

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MPC5200 ATA Interface, Rev. 0
ATA Interface
Freescale Semiconductor 10
intended to help software engineers understand how to initialize the MPC5200 ATA interface and how to
execute standard commands.
NOTE
Flash storage media require a different set of commands that are not
described in this application note. It is recommended to first read the
identify table for each ATA device found on the ATA bus. It contains
specific information needed to handle the device properly. For protocol and
identification information details, see
Attachment with Packet Interface
Extension, ANSI NCITS 317-1998.
.
2.9.1 Drive Initialization
2.9.1.1 PIO Initialization Protocol Steps
1. Select drive according to device selection protocol in ATA/ATAPI-4 spec:
a) Wait for BSY
6
=0 and DRQ
7
= 0 in ATA drive alternate status register
Table 5. ATA Protocols
Protocol Commands
Device reset protocol —
Execute device diagnostic
protocol
—
Device selection protocol —
PIO data-in command protocol
CFA TRANSLATE SECTOR
,
IDENTIFY DEVICE
,
IDENTIFY PACKET DEVICE
,
READ BUFFER
,
READ MULTIPLE
,
READ SECTOR
(
S
),
SMART READ DATA
PIO data-out command protocol
CFA WRITE MULTIPLE WITHOUT ERASE
,
CFA WRITE SECTORS WITHOUT ERASE
,
DOWNLOAD MICROCODE
,
SECURITY DISABLE PASSWORD
,
SECURITY ERASE UNIT
,
SECURITY SET PASSWORD
,
SECURITY UNLOCK
,
WRITE BUFFER
,
WRITE MULTIPLE
,
WRITE SECTOR
(
S
)
Non-data command protocol
CFA ERASE SECTORS
,
CFA REQUEST EXTENDED ERROR CODE
,
CHECK POWER MODE
,
FLUSH CACHE
,
GET MEDIA STATUS IDLE
,
IDLE IMMEDIATE
,
INITIALIZE DEVICE
PARAMETERS
,
MEDIA EJECT
,
MEDIA LOCK
,
MEDIA UNLOCK
,
NOP
,
READ NATIVE MAX
ADDRESS
,
READ VERIFY SECTOR
(
S
,
SECURITY ERASE PREPARE
,
SECURITY FREEZE
LOCK SEEK
,
SET FEATURES
,
SET MAX ADDRESS
,
SET MULTIPLE MODE SLEEP
,
SMART
DISABLE OPERATION
,
SMART ENABLE
/
DISABLE AUTOSAVE
,
SMART ENABLE
OPERATION
,
SMART EXECUTE OFFLINE IMMEDIATE
,
SMART RETURN STATUS
,
STANDBY
,
STANDBY IMMEDIATE
DMA command protocol
READ DMA
,
WRITE DMA
Packet non-data and PIO data
command protocol
PACKET
,
SERVICE
Packet DMA command protocol
PACKET
,
SERVICE
Read/write DMA queued
command protocol
READ DMA QUEUED
,
SERVICE
,
WRITE DMA QUEUED
6. BSY - The Drive Busy bit indicates that the device is busy.
7. DRQ - The Data Request bit indicates that the device is ready to transfer a word of data between the host and the device.