Digi JACKRABBIT BL1800 User Manual download pdf (Page 35)

User’s Manual 31

3.6 Memory

3.6.1 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 13 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 13. Jackrabbit Jumper Settings for SRAM Size

NOTE: For ordering or other information involving the factory-installed 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.

3.6.2 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.

JP1

128K

JP1

512K

SRAM

JP1

VIN GNDGND

RESET

JACKRABBIT

Z-World, Inc.

GND

PA0

PA2

PA4

PA6

GND

PB0

PB2

PB4

PB6

WDO

GND

PE6

PE4

PE2

PE0

HV0

HV2

GND

VCC

PA1

PA3

PA5

PA7

GND

PB1

PB3

PB5

PB7

PCLK

PE7

PE5

PE3

PE1

GND

HV1

HV3

+RAW

VCC

GND

RXC

TXC

PC1

PC3

PC5

PC7

AGND

DA1

PD1

PD3

PD5

PD7

GND

485+

VCC

SM1

STAT

VBAT

GND

VCC

RXB

TXB

PC0

PC2

PC4

PC6

AD0

DA0

PD0

PD2

PD4

PD6

GND

485

VCC

SM0

IOBEN

GND

/RST

SRAM

RS-232

RS-485

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Digi JACKRABBIT BL1800 User Manual Page 35

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