GMS30C7201 Datasheet, PDF (92/352 Pages) Hynix Semiconductor – 60MHz operation frequency Low power consumption

Static Memory Interface
9.1 Overview
The Static Memory Controller interfaces the AMBA Advanced System Bus (ASB) to the
External Bus Interface (EBI). Six separate memory or expansion banks are provided by this
block. Each bank is 64MB in size and can be programmed individually to support:
• 8-, 16- or 32-bit wide, little-endian memory
• burst mode read access support
• variable wait states (up to 16)
In addition, bus transfers can be extended using the EXPRDY input signal. Burst mode access
allows fast sequential access within quad word boundaries. This can significantly improve bus
bandwidth in reading from memory (that must support at least four word burst reads).
External Bus Interface
ASB Bus
EXPRDY
EXPCLK
nWEN[3:0]
nWEF[3:0]
nSRAMOE
nCS[5:0]
SRAMA[1:0]
nSRAMALatch
MemByteSeq[1:0]
nSRAMOutLEn
nSRAMOutEn[3:0]
nSRAMInLEn[3:0]
nSRAMInEn
Access wait state and burst
enable control
Bank configuration registers
Chip select encoder
Access sequence control
BWAIT
BERROR
BLAST
BTRAN[1:0]
BCLK
DSELREG
BD[31:0]
BA[28:26, 5:0]
DSELSRAM
BWRITE
BSIZE[1:0]
BOOTSBIT[1:0] BnRES
Figure 9-1: Static Memory Controller block diagram
9-2
GMS30C7201 Data Sheet