Zilog Z8F0411 Uživatelský manuál stáhnout pdf (Strana 34)

MDS General-Purpose Board Development Kit

User Manual

UM016905-1207 MDS-GP Board Features

Due to possible electromagnetic interference (EMI) from the

circuitry surrounding the dinsmore 1490 digital compass,

Zilog

recommends mounting this device off-board using a

short ribbon cable.

RAM and Flash Decode

The MDS-GP board includes 512 KB fast SRAM, device U22. This

memory can only be used by MDS-PM board that supports an external

address/data bus.

The MDS-GP board also includes two footprints on the back of the board

for adding user- installed flash memory devices. Zilog

cannot control the

quality of added flash devices or their installation, so use these footprints

at your own risk.

Address decoding for the included SRAM, external I/O bus (see External

Data Bus I/O on page 10), and user- installed flash is factory programmed

by PAL U26, as shown in Table 4.

Table 4. PAL U26 Decode

Chip

Select Device

Decode

Address A23 A22 A21 A20

CS2 512 KB SRAM, U22 B0000h 1 0 1 1

External bus, J7 D0000h 1 1 0 1

CS0 User-installed Flash, U24 40000h 0 1 0 0

User-installed Flash, U27 50000h 0 1 0 1

Caution:

1 2 ... 29 30 31 32 33 34 35 36 37 38 39 ... 82 83

Žádné komentáře

Zilog Z8F0411 Uživatelský manuál Strana 34