Texas Instruments OMAP5912 Reference Manual page 121

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Figure 28.
Mode 4 Synchronous Burst 4x16-Bit Read Operation on 16-Bit Width Device
With Retiming on (RDWST=2, FCLKDIV =0, ADVHOLD=0, RDMODE=4). Data write-back
on the bus after read completion.
TC_CLK
REF_CLK
RET REF_CLK
FLASH.CSx
FLASH.ADV
FLASH.A(25:1)
FLASH.OE
FLASH.D(15:0)
Retimed Flash
data(15:0)
FLASH_DIR_O
FLASH.BAA
FLASH.BE(1:0)
FLASH.RDY
SPRU749A
-
The retiming mode is enabled through the RT bit field in the CS
configuration register. Retiming mode is only allowed in synchronous
modes 4−5−7 and has no effect on write accesses.
N +1 cycles
-
As in non-retimed mode, CS, ADV, Address, BE, OE, and BAA are driven
with respect to REF_CLK.
-
Modes 4 and 5 programming model and protocol behavior remain the
same as in non-retimed mode.
-
In retiming mode, the RDWST is still referenced to REF_CLK. The
retiming relaxed timing (extra delay for data valid) is included in the IC
timing parameters.
-
FLASH.RDY is also retimed with the Ret_REF_CLK. The retiming relaxed
timing (extra delay for ready valid) is included in the IC timing parameters.
Valid address
D0
D1
D2
D0
D1
00
OMAP3.2 Subsystem
Traffic Controller
Î Î Î Î
D3
D3
Î Î Î Î
Î Î Î Î Î Î Î
D2
D3
63

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