AN2417 Freescale Semiconductor / Motorola, AN2417 Datasheet - Page 8

• Manufacturer Part Number: AN2417
• Description: PCMCIA and Compact Flash Interface for the MC9328MX1 and MC9328MXL Application Processors Application Note
• Manufacturer: Freescale Semiconductor / Motorola

Compact Flash Timing Characteristics
1.6.6 Signals Not Implemented
BVD1 BVD2
These signals are used as battery detect in PCMCIA in memory mode, and are not necessary and supported
in Compact Flash specification
In I/O mode, BVD1 is used as Status change signal STSCHG which will assert low to assert host change in
the RDY/BSY and write protect states. Same function can be found in Pin Replacement Register of
attribute memory.
BVD2 will be used as speaker output signal SPKR for binary audio output from the card in I/O mode.
These signal are not implemented as they have insignificant application for Compact Flash and for the
reason of limited number GPIO available.
INPACK
The input acknowledgement signal is used in I/O mode only to indicate the address on address bus is
referring to I/O read cycle. This signal is originally used for enabling input data buffer between Compact
Flash and the processor. This signal is not implemented as it is not related to the functionality of the
Compact Flash interface.
CSEL
The CSEL signal is used for configuring device as master or slave in TrueIDE mode. As True IDE mode is
not supported, this signal is not implemented
2 Compact Flash Timing Characteristics
2.1 Timing Requirement for Read Cycle
As EIM do not distinguish between memory read cycle and I/O read cycle, the interface timing is reference
from the read cycle timing requirement in both memory mode and I/O mode. The following timing
parameters work for both memory mode and I/O mode read cycle and is the reference design timing
parameter determined from the host side.
8
Signal Name
CD1#, CD2#
Total Number
of Pin
2
Freescale Semiconductor, Inc.
For More Information On This Product,
MC9328MX1/MXL Application Note
Direction of
Engineering Draft / Preliminary
Signal
Output
Go to: www.freescale.com
Table 6.
Used for card
insert detection
Function
Connection to MC9328MX1/MXL
GPIO PA20 through OR gate
Connection to MX1
MOTOROLA