Mode 7-Synchronous Burst Read Operation Mode - Texas Instruments OMAP5912 Reference Manual

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Figure 30.
Mode 4 Synchronous Burst 4x16-Bit Read Operation on Multiplexed
Address/Data 16-Bit Width Device With Retiming on (RDWST=3, FCLKDIV =0,
ADVHOLD=0, OESETUP = 3, RMODE=4). Data write-back on the bus after read
completion.
TC_CLK
REF_CLK
RET REF_CLK
FLASH.CSx
FLASH.ADV
FLASH.A/D(15:0)/
FLASH.A(25:16)
Retimed data(15:0)
FLASH.OE
FLASH_DIR_O
FLASH.BAA
FLASH.BE(1:0)
FLASH.RDY
3.2.13
Mode 7—Synchronous Burst Read Operation Mode
SPRU749A
N +1 cycles
Valid address
-
The synchronous burst read mode 7 is selected by setting the RDMODE
bit field in the corresponding EMIFS chip-select configuration register
J
RDMODE = 7
-
This mode only supports synchronous read accesses (single or
consecutive). This protocol is used when accessing boot ROM and secure
RAM.
The following diagrams show 16−bit external device widths. Similar accesses
occur when using the 32−bit width of the secure RAM and boot ROM.
D0
D1
D2
D3
Î Î Î Î Î Î Î
D0
D1
D2
00
OMAP3.2 Subsystem
Traffic Controller
Î Î Î Î
D3
Î Î Î Î
D3
65

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