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14 RabbitCore 2000
2.6 Memory
2.6.1 SRAM
The RabbitCore 2000 is designed to accept 32K to 512K of SRAM packaged in an SOIC
case.
The existing standard models of the RabbitCore 2000 come with 128K or 512K of SRAM.
Figure 6 shows the locations and the jumper settings for the jumpers at JP1 used to set the
SRAM size. The “jumpers” are 0 Ω surface-mounted resistors.
Figure 6. RabbitCore 2000 Jumper Settings
for SRAM and Flash EPROM Size
2.6.2 Flash EPROM
The RabbitCore 2000 is also designed to accept 128K to 512K of flash EPROM packaged
in a TSOP case.
The existing standard models of the RabbitCore 2000 come with 256K of flash EPROM.
Figure 6 shows the locations and the jumper settings for the jumpers at JP2 used to set the
flash EPROM size. The “jumpers” are 0 Ω surface-mounted resistors.
Z-World recommends that any customer applications should not be constrained by the
sector size of the flash EPROM since it may be necessary to change the sector size in
the future.
2.6.3 Dynamic C BIOS Source Files
The Dynamic C BIOS source files handle different standard RAM and flash EPROM sizes automatically.
C4
U1
U2
R4
Y2
C5
R3
Y1
C1
C2
R2
TP1
R1
JP1
C3
TP3
TP2
J3
PB5
PB7
GND
PB4
PB6
PCLK
D6
D7
D2
D3
D5
D4
D1
D0
PE7
PE6
PE5
PE4
PE3
PE2
PE1
PE0
/IOW
/IOR
/BEN
/WDO
PA1
PA3
PA5
PA7
PB1
PB3
GND
PA0
PA2
PA4
PA6
PB0
PB2
J1
VCC
J2
A12
A10
A8
A6
A4
A2
A0
A11
A9
A7
A5
A3
A1
STAT
PC0
PC2
PC4
PC6
PD0
PD2
PD4
PD6
GND
VBAT
PC1
PC3
PC5
PC7
PD1
PD3
PD5
PD7
VCC
SM1
GND
VRAM
SM0
VCC
/RESO
/RSTI
J1
U11
C16
R37
R38
R40
R41
R42
R39
C17
C18
R14
R19 R20
C12
C13
R26
R25
R24
R22
R21
R23
C10
C11
R13
D11 R11 R12D12
R18
R15
R28
R29
R30
Q14
R31
D10Q11Q10R10
R16
R17
JP2
Q15 D13
C15
R33
R36
R32
R34
R35
U10
C14
R27
Flash
EPROM
Q12
Q13
A12
A6
A4
A2
A0
PC0
PC2
PC4
PC6
PD0
PD2
PD4
PD6
GND
VBAT
SM0
/RESO
VCC
A10
A8
GND
/RSTI
SM1
VRAM
VCC
PD7
PD5
PD3
PD1
PC7
PC5
PC3
PC1
STAT
A1
A3
A5
A7
A9
A11
VCC
PA1
PA3
PA5
PA7
PB1
PB3
PB5
PB7
GND
D6
D4
D2
D0
/WDO
/IOR
PE0
PE2
PE4
PE6
/BEN
/IOW
PE1
PE3
PE5
PE7
D1
D3
D5
D7
PCLK
PB6
PB4
PB2
PB0
PA6
PA4
PA2
PA0
GND
1
2
3
JP1
1
2
3
128K
JP1
512K
SRAM
SRAM
Top Side
1
2
3
JP2
1
2
3
128K/256K
JP2
512K
Flash EPROM
Bottom Side
!