EZ80F920120MOD Zilog, EZ80F920120MOD Datasheet - Page 63

• Manufacturer Part Number: EZ80F920120MOD
• Description: MODULE EZ80F92 512K 20MHZ
• Manufacturer: Zilog

Specifications of EZ80F920120MOD

• Module/board Type: Development Module
• Processor Series: EZ80F92x
• Core: eZ80
• Data Bus Width: 8 bit
• Program Memory Type: Flash
• Program Memory Size: 1 MB
• Interface Type: Cable
• Maximum Clock Frequency: 20 MHz
• Operating Supply Voltage: 0 V to 3.3 V
• Maximum Operating Temperature: + 70 C
• Mounting Style: SMD/SMT
• Package / Case: LQFP
• Development Tools By Supplier: eZ80F920200ZCOG
• Minimum Operating Temperature: 0 C
• For Use With/related Products: eZ80F92
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 269-3157; EZ80F920120MOD

PS015308-0404
Memory Chip Select Priority
A lower-numbered Chip Select is granted priority over a higher-numbered Chip Select.
For example, if the address space of Chip Select 0 overlaps the Chip Select 1 address
space, Chip Select 0 is active.
Reset States
On RESET, Chip Select 0 is active for all addresses, because its Lower Bound register
resets to
Lower and Upper Bound registers reset to
Memory Chip Select Example
The use of Memory Chip Selects is demonstrated in Figure 6. The associated control reg-
ister values indicated in Register Values for Memory Chip Select Example in Figure 6. In
this example, all 4 Chip Selects are enabled and configured for memory addresses. Also,
CS1 overlaps with CS0. Because CS0 is prioritized higher than CS1, CS1 is not active for
much of its defined address space.
Figure 6.Example: Memory Chip Select
CS0_LBR = CS1_LBR = 00h
00h
CS2_UBR = CFh
CS3_UBR = FFh
CS1_UBR = 9Fh
CS0_UBR = 7Fh
CS3_LBR = D0h
CS2_LBR = A0h
and its Upper Bound register resets to
P R E L I M I N A R Y
3 MB Address Space
3 MB Address Space
2 MB Address Space
8 MB Address Space
CS3 Active
CS2 Active
CS1 Active
CS0 Active
00h
.
FFh
. All of the other Chip Select
Memory
Location
FFFFFFh
D00000h
CFFFFFh
A00000h
9FFFFFh
800000h
7FFFFFh
000000h
Chip Selects and Wait States
Product Specification
eZ80F92/eZ80F93
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