Freescale Semiconductor MPC5200B - Manual (Page 397)

MPC5200B Users Guide, Rev. 1
11-32 Freescale Semiconductor
ATA Bus Background
Figure 11-6. Timing Diagram—PIO Write Command (Class 2)
11.7.4.1.3 Class 3—Non-Data Command
The Non-Data Command is as follows:
1. HOST: Write to ATA control/command block registers to setup for data read.
2. HOST: Write to ATA command register to execute read command.
3. DRIVE: Execute command.
Figure 11-7
shows the Non-Data Command.
Figure 11-7. Timing Diagram—Non-Data Command (Class 3)
11.7.4.2 DMA Protocol
The DMA protocol has the following commands:
• READ DMA
• WRITE DMA
The Host selects the multiword DMA protocol as follows:
1. Write 00100b to upper 5 bits ([7:3]) of sector count register to select multiword DMA protocol. Write desired mode value to lower
3 bits ([2:0]) of sector count register to set multiword DMA transfer mode (mode 0=000b, mode 1=001b, etc.).
2. Write sub-command code 0x03 to features register to set transfer mode, based on value in sector count register.
Set Up
Register
Block
Send
Command
Read
Status
Write
Sector
Buffer
Write
Sector
Read
Status
Write
Sector
Buffer
Write
Sector
Host
Drive
DRDY
BSY
DRQ
INTRQ
Set Up
Register
Block
Send
Command
Execute
Command
Host
Drive
DRDY
BSY
DRQ
INTRQ
Set Up
Register
Block
Send
Command
Execute
Command