ez80f91 ZiLOG Semiconductor, ez80f91 Datasheet - Page 75

• Manufacturer Part Number: ez80f91
• Description: Ez80 Acclaimplus!? Connectivity Assp Ez80f91 Assp
• Manufacturer: ZiLOG Semiconductor

Table 18. Example: Register Values for Figure 7 Memory Chip Select
Chip
Select
CS0
CS1
CS2
CS3
PS027001-0707
CSx_CTL[3]
CSx_EN
CS0_LBR = CS1_LBR = 00h
1
1
1
1
CSx_CTL[4]
CS2_UBR = CFh
CS3_UBR = FFh
CS1_UBR = 9Fh
CS0_UBR = 7Fh
CS3_LBR = D0h
CSx_IO
CS2_LBR = A0h
0
0
0
0
Figure 7. Example: Memory Chip Select
CSx_LBR
A0h
D0h
00h
00h
3 MB Address Space
3 MB Address Space
2 MB Address Space
8 MB Address Space
CS3 Active
CS2 Active
CS1 Active
CS0 Active
CSx_UBR Description
CFh
7Fh
9Fh
FFh
CS0 is enabled as a Memory chip
select. Valid addresses range from
000000h–7FFFFFh.
CS1 is enabled as a Memory chip
select. Valid addresses range from
800000h–9FFFFFh.
CS2 is enabled as a Memory chip
select. Valid addresses range from
A00000h–CFFFFFh.
CS3 is enabled as a Memory chip
select. Valid addresses range from
D00000h–FFFFFFh.
Memory
Location
FFFFFFh
D00000h
CFFFFFh
A00000h
9FFFFFh
800000h
7FFFFFh
000000h
Chip Selects and Wait States
Product Specification
eZ80F91 ASSP
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