User`s guide

External Memory LZ87010 Advance User’s Guide
11-2 1/15/03
Figure 11-1. External Memory Interface
LZ87010-90
XMCFG.XMBNK
MEMORY MAP
CONTROL
MAP ALL TO FLASH
XMCFG.XMALL
0 - 15 WAIT STATES
XMCFG.XMCC
3
1
A[15:0]
D[7:0]
nRD
nWR
WAIT
16
4
MEMORY
SELECT
INTERNAL TO
THE LZ87010
EXTERNAL TO
THE LZ87010
A[15:0]
EN
WAIT
EXTERNAL
MEMORY
TIMING
CONTROL
EXTERNAL
MEMORY
D[7:0]
nWR
nRD
XMA[15:0]
XMD[7:0]
nPSEN
nPSWR
A[15:0]
D[7:0]
nOE
nWR
EN nRD nWR
FLASH MEMORY
A[15:0] D[7:0]
XMBNK[2:0]
FLASH
ADDRESS RANGE
000
001
010
011
100
101
110
111
0x0000 - 0xDFFF
0x0000 - 0xBFFF
0x0000 - 0x9FFF
0x0000 - 0x7FFF
0x0000 - 0x5FFF
0x0000 - 0x3FFF
0x0000 - 0x1FFF
NONE
EXTERNAL MEMORY
ADDRESS RANGE
0xE000 - 0xFFFF
0xC000 - 0xFFFF
0xA000 - 0xFFFF
0x8000 - 0xFFFF
0x6000 - 0xFFFF
0x4000 - 0xFFFF
0x2000 - 0xFFFF
0x0000 - 0xFFFF