STATIC MEMORY CONTROLLER
S3C2416X RISC MICROPROCESSOR
5-4
3.1 ASYNCHRONOUS
READ
Figure 5-3 shows an external memory read transfer with two output enable delay states, WSTOEN = 2, and two
wait states, WSTRD = 2. Four AHB wait states are inserted during the transfer, two for the standard read, and
additional two because of the programmed wait states added.
The PSMAVD signal might be required for synchronous static memory devieces when you use it in asynchronous
mode. You can disable this using the AddrValidReadEn bit in the SMBCRx register. This bit defaults to being set
(enable) to enable a system to boot from synchronous memory. You can then clear it if you do not require it.
When disabled, the signal is driven HIGH continuously.
SMCLK
ADDR
DATA(IN)
Asynchronous Read
nCS
nOE
A
D(A)
WSTRD=2
WSTOEN=2
Figure 5-3. External Memory Two Output Enable Delay State Read
SMCLK
ADDR
DATA ( R )
nCS
nWAIT
A
D(A)
nOE
Figure 5-4. Read Timing Diagram (DRnCS = 1, DRnOWE = 0)
Содержание S3C2416
Страница 33: ...S3C2416X RISC MICROPROCESSOR PRODUCT OVERVIEW 1 5 3 BLOCK DIAGRAM Figure 1 1 S3C2416X Block Diagram ...
Страница 38: ...PRODUCT OVERVIEW S3C2416X RISC MICROPROCESSOR 1 10 153 AIN 1 U14 195 EINT 10 GPG2 K15 237 SDATA 14 C18 ...
Страница 122: ...BUS MATRIX EBI S3C2416X RISC MICROPROCESSOR 3 4 NOTES ...
Страница 204: ...DMA CONTROLLER S3C2416X RISC MICROPROCESSOR 8 18 NOTES ...
Страница 284: ...WATCHDOG TIMER S3C2416X RISC MICROPROCESSOR 11 6 NOTES ...
Страница 320: ...REAL TIME CLOCK S3C2416X RISC MICROPROCESSOR 13 16 NOTES ...
Страница 344: ...UART S3C2416X RISC MICROPROCESSOR 14 24 NOTES ...
Страница 380: ...USB2 0 DEVICE S3C2416X RISC MICROPROCESSOR 16 34 NOTES ...
Страница 432: ...2D S3C2416X RISC MICROPROCESSOR 18 38 NOTES ...
Страница 446: ...HS_SPI CONTROLLER S3C2416X RISC MICROPROCESSOR 19 14 NOTES ...
Страница 455: ...S3C2416X RISC MICROPROCESSOR HSMMC CONTROLLER 20 9 4 9 SD COMMAND ISSUE SEQUENCE Figure 20 9 Timeout Setting Sequence ...
Страница 604: ...S3C2416X RISC MICROPROCESSOR S3C2416X RISC MICROPROCESSOR 23 22 NOTES ...
Страница 638: ...PCM AUDIO INTERFACE S3C2416X RISC MICROPROCESSOR 25 18 NOTES ...
Страница 653: ...S3C2416X RISC MICROPROCESSOR ELECTRICAL DATA 26 15 Figure 26 14 SDRAM READ WRITE Timing Trp 2 Trcd 2 Tcl 2 DW 16 bit ...
Страница 670: ...ELECTRICAL DATA S3C2416X RISC MICROPROCESSOR 26 32 NOTES ...
Страница 672: ...MECHANICAL DATA S3C2416X RISC MICROPROCESSOR 30 2 Figure 27 2 330 FBGA 1414 Package Dimension 2 Bottom View ...