AN2417 Freescale Semiconductor / Motorola, AN2417 Datasheet - Page 9

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

2.2 Timing Requirement for Write Cycle
As EIM do not distinguish between memory write cycle and I/O read cycle, the interface timing is
reference from the write cycle timing requirement in both memory mode and I/O mode. The following
timing parameters work for both memory mode and I/O mode write cycle and is the reference design
timing parameter determined from the host side
MOTOROLA
Timing
Item
1
2
3
4
5
6
7
CE#
Address Hold
Time for Wait
following OE
following OE
IORD Width
Setup Time
Data Setup
before OE
Data Hold
CE Setup
CE Hold
Address
Release
Time
Time
Item
Address
OE#
Freescale Semiconductor, Inc.
tw(IORD)
tdis(OE)
Symbol
tsu(CE)
tv(WT)
th(CE)
tsu(A)
For More Information On This Product,
th(A)
WAIT#
1
MC9328MX1/MXL Application Note
min 70ns
Engineering Draft / Preliminary
3
Go to: www.freescale.com
Memory Mode
Requirement
max 100ns
min 30ns
min 20ns
min 20ns
min 0ns
min 0ns
min 5ns
Figure 2.
Table 7.
5
min 165ns
Data
min 20ns
6
Requirement
min 165ns
I/O Mode
min 70ns
min 20ns
max 0ns
min 5ns
min 5ns
min 0ns
min 0ns
Compact Flash Timing Characteristics
4
max 100ns
2
min 70ns
achieve by glue logic
min 20ns
timing match by CS5
min 5ns
achieve by glue logic
min 20ns
achieve by glue logic
min 165ns
signal width programmable by
WSC bit in CS5 register/
determined by wait signal
timing match by CS5
buffer is used to ensure
enough hold time
min 20ns
Reference Design Timing
Requirement / Comment
7
9