COM90C66 Ver la hoja de datos (PDF) - SMSC -> Microchip

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COM90C66

ARCNET® Controller/Transceiver with AT® Interface and On-Chip RAM

SMSC -> Microchip 

A13 = 1:

8K PROM SPACE

A13 = 1:

UPPER 8K PROM SPACE

A13 = 0:

A11 AND A12 Select one

of these 2K RAM segments.

A13 = O:

Lower 8K PROM SPACE

FIGURE 7 - 16K MEMORY SEGMENT

CHOSEN BY MS0-MS4

(Memory Mapped Mode)

FIGURE 8 - 16K PROM SEGMENT

CHOSEN BY MSO-MS4

(I/O Mapped, 16K X 8 Mode)

SHORT PACKET

FORMAT (256 OR 512 BYTE PAGE)

LONG PACKET

FORMAT (512 BYTE PAGE)

0

1

2

COUNT

SID

DID

COUNT = 256-N

NOT USED

DATA BYTE 1

DATA BYTE 2

0

1

2

3

COUNT

SID

DID

0

COUNT = 512-N

NOT USED

DATA BYTE 1

N = DATA PACKET LENGTH

SID = SOURCE ID

DID = DESTINATION ID

(DID = 0 FOR BROADCASTS)

DATA BYTE 2

DATA BYTE N-1

255

DATA BYTE N

511

NOT USED

DATA BYTE N-1

511

DATA BYTE N

FIGURE 9 – RAM BUFFER PACKET CONFIGURATION

17

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