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AECLKOUT
ACEx
ABE[7:0]
AEA[19:0]/ABA[1:0]
AED[63:0]
ASADS/ASRE
(B)
AAOE/ASOE
(B)
AAWE/ASWE
(B)
BE1
BE2
BE3
BE4
Q1
Q2
Q3
9
1
4
5
8
9
6
7
3
1
2
EA1
EA2
EA4
8
READ latency = 2
EA3
A The following parameters are programmable via the EMIFA Chip Select n Configuration Register (CESECn):
Read latency (R_LTNCY): 1-, 2-, or 3-cycle read latency
Write latency (W_LTNCY): 0-, 1-, 2-, or 3-cycle write latency
ACEx assertion length (CE_EXT): For standard SBSRAM or ZBT SRAM interface, ACEx goes inactive after the final command has been
issued (CE_EXT = 0). For synchronous FIFO interface, ACEx is active when ASOE is active (CE_EXT = 1).
Function of ASADS/ASRE (R_ENABLE): For standard SBSRAM or ZBT SRAM interface, ASADS/ASRE acts as ASADS with deselect
cycles (R_ENABLE = 0). For FIFO interface, ASADS/ASRE acts as SRE with NO deselect cycles (R_ENABLE = 1).
In this figure R_LTNCY = 2, CE_EXT = 0, R_ENABLE = 0, and SSEL = 1.
B AAOE/ASOE, and AAWE/ASWE operate as ASOE, and ASWE, respectively, during programmable synchronous interface accesses.
Q4
AECLKOUT
ACEx
ABE[7:0]
AEA[19:0]/ABA[1:0]
AED[63:0]
ASADS/ASRE
(B)
AAOE/ASOE
(B)
AAWE/ASWE
(B)
A The following parameters are programmable via the EMIFA Chip Select n Configuration Register (CESECn):
Read latency (R_LTNCY): 1-, 2-, or 3-cycle read latency
Write latency (W_LTNCY): 0-, 1-, 2-, or 3-cycle write latency
ACEx assertion length (CE_EXT): For standard SBSRAM or ZBT SRAM interface, ACEx goes inactive after the final command has been
issued (CE_EXT = 0). For synchronous FIFO interface, ACEx is active when ASOE is active (CE_EXT = 1).
Function of ASADS/ASRE (R_ENABLE): For standard SBSRAM or ZBT SRAM interface, ASADS/ASRE acts as ASADS with deselect
cycles (R_ENABLE = 0). For FIFO interface, ASADS/ASRE acts as SRE with NO deselect cycles (R_ENABLE = 1).
In this figure W_LTNCY = 0, CE_EXT = 0, R_ENABLE = 0, and SSEL = 1.
B AAOE/ASOE, and AAWE/ASWE operate as ASOE, and ASWE, respectively, during programmable synchronous interface accesses.
BE1
BE2
BE3
BE4
Q1
Q2
Q3
Q4
12
11
3
1
12
10
4
2
1
8
5
8
EA1
EA2
EA3
EA4
10
TMS320TCI6482
Communications Infrastructure Digital Signal Processor
SPRS246F–APRIL 2005–REVISED MAY 2007
Figure 8-36. Programmable Synchronous Interface Read Timing for EMIFA (With Read Latency = 2)
(A)
Figure 8-37. Programmable Synchronous Interface Write Timing for EMIFA (With Write Latency = 0)
(A)
C64x+ Peripheral Information and Electrical Specifications
166
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