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FCLK
WrCycleTime = 6
nADV
AdvWrOffTime = 1
nCS
nWE
ADDRESS
A/D bus
CsWriteOffTime = 6
WeOffTime = 5
WeOnTime = 2 (at least 1)
Access Completion / Data Hold time
ADDRESS
DATA
DATA
At least > 25 ns (tWP)
At least > 20 ns (tWPH)
gpmc-040
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General-Purpose Memory Controller
Table 10-22. AC Characteristics for Asynchronous Single Write ( Memory Side) (continued)
AC Characteristics on the Memory Side
Description
Duration (ns)
tWPH
Write pulse width high
20
tCS
nCS setup time to nWE
3
tCAS
nCS setup time to nADV
0
tAVSC
nADV setup time
3
For asynchronous single write access, write cycle time is WrCycleTime = WeO AccessCompletion
= WeO 1. For the AccessCompletion: 1 cycle is required for data hold time (nCS deassertion).
Table 10-23. GPMC Timing parameters for Asynchronous Single Write
Parameter Name on
Formula
Duration (ns)
Number of
GPMC Registers
GPMC side
Clock Cycles
Configuration
(F = 104 MHz)
ClkActivationTime
n/a (asynchronous mode)
AccessTime
Applicable only to WAITMONITORING (the value is the same as for read access)
PageBurstAccessTime
n/a (single access)
WrCycleTime
WeO
57, 615
6
WRCYCLETIME = 0x06
AccessCompletion
CsOnTime
tCAS
0
0
CSONTIME = 0x0
CsWrOffTime
WeO 1
57, 615
6
CSWROFFTIME = 0x06
AdvOnTime
tAVSC
3
1
ADVONTIME = 0x1
AdvWrOffTime
tAVSC + tAVDP
9
1
ADVWROFFTIME =
0x01
WeOnTime
tCS
3
1
WEONTIME = 0x1
WeOffTime
tCS + tWP + tWPH
48
5
WEOFFTIME = 0x05
Figure 10-40. Asynchronous Single Write Access (Timing Parameters in Clock Cycles)
10.1.6.2 How to Choose a Suitable Memory to Use With the GPMC
This section explains how to select a suitable memory device to interface with the GPMC controller.
2191
SWPU177N – December 2009 – Revised November 2010
Memory Subsystem
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