Memory; Sram; Flash Eprom - Z-World BL1800 User Manual

2.6 Memory

2.6.1 SRAM

The Jackrabbit is designed to accept 32K to 512K of SRAM packaged in an SOIC case.
Standard Jackrabbit models come with 128K of SRAM. A factory-installed option for 512K
of SRAM is available. Figure 11 shows the locations and the jumper settings for the jump-
ers at JP1 used to set the SRAM size. The "jumpers" are 0 Ω surface-mounted resistors.
Figure 11. Jackrabbit Jumper Settings for SRAM Size
NOTE: For ordering or other information involving the factory-intsalled 512K SRAM
option, call your Z-World Sales Representative at (530)757-3737.
No 0 Ω surface-mounted resistors are installed at JP1 for 32K SRAM.

2.6.2 Flash EPROM

The Jackrabbit is also designed to accept 128K to 512K of flash EPROM packaged in a
TSOP case.
NOTE: Z-World recommends that any customer applications should not be constrained
by the sector size of the flash memory since it may be necessary to change the sector
size in the future.
A Flash Memory Bank Select jumper configuration option exists at JP3 with 0 Ω surface-
mounted resistors for Jackrabbit boards labeled 175-0255. This option, used in conjunc-
tion with some configuration macros, allows Dynamic C to compile two different co-resi-
dent programs for the upper and lower halves of the 256K flash in such a way that both
programs start at logical address 0000. This is useful for applications that require a resi-
dent download manager and a separate downloaded program. See Technical Note 218,
Implementing a Serial Download Manager for a 256K Flash, for details.
User's Manual
128K
JP1
U1
J4
GND VCC
PA0 PA1
PA2 PA3
PA4 PA5
PA6 PA7
U3
GND GND
PB0 PB1
PB2 PB3
PB4 PB5
PB6 PB7
WDO PCLK
GND PE7
PE6 PE5
PE4 PE3
PE2 PE1
PE0 GND
J1
HV0 HV1
J2
HV2 HV3
K +RAW
GND VCC
Y3
J3
JACKRABBIT Z-World, Inc.
SRAM
512K
JP1
3 2 1 3 2 1
U4
J5
VCC GND
JP1
RXB RXC
TXB TXC
U5
PC0 PC1
PC2
PC3
PC4
PC5
SRAM
PC6 PC7
AD0 AGND
DA0 DA1
PD0 PD1
PD2
PD3
PD4
PD5
PD6 PD7
GND GND
485– 485+
VCC VCC
U6
SM0
SM1
IOBEN
STAT
GND VBAT
RS-485
/RST GND
RESET
23