Freescale Semiconductor MPC5200B ユーザーズマニュアル
Overview
MPC5200B Users Guide, Rev. 1
Freescale Semiconductor
11-1
Chapter 11
ATA Controller
ATA Controller
11.1
Overview
The following sections are contained in this document:
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The Advanced Technology Attachment (ATA) Controller provides full functional compatibility with ATA-4 documentation, supporting
Ultra-33. For more ATA Standards information, refer to "American National Standard for Information Technology—AT Attachment with
Packet Interface Extension (ATA/ATAPI-4)".
Ultra-33. For more ATA Standards information, refer to "American National Standard for Information Technology—AT Attachment with
Packet Interface Extension (ATA/ATAPI-4)".
A dedicated MPC5200B pin for ATA reset is not provided. An appropriate signal on the board should be routed to the reset input on the ATA
connector. If ATA reset is tied to
connector. If ATA reset is tied to
HRESET
or
SRESET
on MPC5200B pins, they are asserted and internally held low for an appropriate
period of time to satisfy ATA reset. An MPC5200B GPIO may be used to drive ATA reset independently if special software control is needed.
shows the ATA Controller Interface.
Figure 11-1. ATA Controller Interface
11.2
BestComm Key Features
11.2.1
BestComm Read
1.
microprocessor sets up descriptors in BestComm RAM and initiates a transfer.
2.
BestComm hits on an ATA command FIFO space and writes a command (ATA drive register address, transfer size) into FIFO.
3.
ATA Controller reads data from the drive and puts data in FIFO.
(higher priority)
IP bus
BestComm
IPBI
ARB
Rx/Tx FIFO
Interface
IPBI
Local Bus
ATA Host
Controller
Ultra DMA
Channel
Multiword
DMA
Channel
Program
Registers
(Host/Driver)
PIO
Channel
PCI Handshake