xccace-tq144 Xilinx Corp., xccace-tq144 Datasheet - Page 44

• Manufacturer Part Number: xccace-tq144
• Description: Ic Ace Controller Chip Tq144
• Manufacturer: Xilinx Corp.

System ACE CompactFlash Solution
Check if Ready for a Command Control
Flow Process
Before reading or writing sector data, it is important to make
sure that the CompactFlash device is ready for a command.
44
Decrement timer
Figure 24: Check if Ready for a Command Control Flow Process
variable
No
Initialize timer variable
Check If Ready
Timer Expired?
Return timeout
For Command
Get Command
Ready Status
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Command?
Ready For
Busy.
error.
No
Yes
This is done by polling the RDYFORCFCMD bit (bit 0) in the
second byte of the STATUSREG register (MPU byte
address 05h) until it is set to a 1. This control flow process is
shown in
Figure
Yes
from byte address 05h
Read RDYFORCMD bit
24.
Return success.
DS080_50_051701
Ready.
DS080 (v2.0) October 1, 2008
Product Specification
R