ClkActivationTime = 1
FCLK
CLK
tIACC (access time on memory side)
AccessTime = 10
Data Setup
nADV
AdvRdOffTime = 2
Access Completion
last burst access
RdCycleTime = 11
nCS
nOE
Valid Address
D0
D1
D2
D3
A/D bus
2nd burst access
3rd
CsReadOffTime = RdCycleTime
OeOffTime = RdCycleTime
OeOnTime = 3
GPMC
Table 7-47. Calculating GPMC Timing Parameters
Number of
Clock Cycles
Parameter Name on
(F = 104
GPMC Side
Formula
Duration (ns)
MHz)
GPMC Register Configurations
GPMC FCLK Divider
-
-
-
GPMCFCLKDIVIDER = 0
ClkActivationTime
min ( tCES, tACS)
3
1
CLKACTIVATIONTIME = 1
10 :
roundmax (ClkActivati
94,03: (9,615 +
roundmax
RdAccessTime
ACCESSTIME = Ah
tIACC + DataSetupTime)
80 + 4,415)
(94,03 /
9,615)
PageBurstAccessTime
roundmax (tBACC)
roundmax (5,2)
1
PAGEBURSTACCESSTIME = 1
101, 03: (94, 03
RdCycleTime
Acce max ( tCEZ, tOEZ)
11
RDCYCLETIME = Bh
+ 7)
CsOnTime
tCES
0
0
CSONTIME = 0
CsReadOffTime
RdCycleTime
-
11
CSRDOFFTIME = Bh
AdvOnTime
tAVC
0
0
ADVONTIME = 0
AdvRdOffTime
tAVD + tAVC
12
2
ADVRDOFFTIME = 2h
(ClkActivati tACH) <
OeOnTime
OeOnTime < (ClkActivationTime
-
3, for instance OEONTIME = 3h
+ tIACC)
OeOffTime
RdCycleTime
-
11
OEOFFTIME = Bh
Figure 7-48. Synchronous Burst Read Access (Timing Parameters in Clock Cycles)
358
Memory Subsystem
SPRUH73H – October 2011 – Revised April 2013
Copyright © 2011–2013, Texas Instruments Incorporated