TMS320C6454

Fixed-Point Digital Signal Processor

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SPRS311A –APRIL 2006 –REVISED DECEMBER 2006

Write

Latency =

1(B)

AECLKOUT

 

 

 

 

 

 

1

 

 

 

1

ACEx

 

 

 

 

 

 

2

 

 

 

3

ABE[7:0]

BE1

BE2

BE3

BE4

 

 

4

 

 

 

5

AEA[19:0]/ABA[1:0]

EA1

EA2

EA3

EA4

 

 

10

10

 

 

11

AED[63:0]

 

Q1

Q2

Q3

Q4

ASADS/ASRE (B)

8

 

 

 

8

 

 

 

 

 

AAOE/ASOE (B)

 

 

 

 

 

 

12

 

 

 

12

AAWE/ASWE(B)

 

 

 

 

 

AThe following parameters are programmable via the EMIFA Chip Select n Configuration Register (CESECn):

Read latency (R_L TNCY): 1-, 2-, or 3-cycle read latency

W rite latency (W_LTNCY): 0-, 1-, 2-, or 3-cycle read 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_L TNCY = 1, CE_EXT = 0, R_ENABLE = 0, and SSEL = 1.

BAAOE/ASOE, and AAWE/ASWE operate as ASOE, and ASWE, respectively, during programmable synchronous interface accesses.

Figure 7-38. Programmable Synchronous Interface Write Timing for EMIFA (With Write Latency = 1) (A)

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Texas Instruments TMS320C6454 warranty Write Latency =