Kawasaki KS152JB, 80C152, 80C51 Control cpu Control dma Raw Receive Raw Transmit

KS152JB Universal Communications Controller Technical Specifications

Table 10:

backoff

preamble

Jam

Clock

contr

r

ol

r

a

a

d

w

c

e

i

w

N-Not available.

e

s

a

s

t

x

n

r

m

M-Mandatory.

n

lt

e

n

8

3

6

c

tr

d

O-Optional.

t

t

e

a

o

e

r

2

4

c

d

a

l

P-Normally Preferred

o

d

r

e

e

c

/

r

r

m

b

p

m

n

c

X-N/A

m

n

i

n

c

c

r

r

e

c

i

b

b

u

a

s

a

a

n

e

/

n

n

i

d

l

t

i

t

it

it

m

a

a

v

e

s

it

ti

l

l

e

c

Control cpu

O

O

O

O

O

O

O

O

O

O

O

X

N

O

O

O

O

Control dma

O

O

O

O

O

O

O

O

O

O

O

N

X

O

O

O

O

Raw Receive

O

O

O

1

1

1

1

O

O

1

1

1

1

X

N

1

1

Raw Transmit

N

N

N

1

1

1

1

N

N

1

1

1

1

N

X

1

1

CSMA

O

O

O

N

O

O

O

O

O

N

O

O

O

O

O

X

N

SDLC

N

N

N

P

O

O

O

N

N

O

O

O

O

O

O

N

X

Note 1: Programmable in Raw transmit or receive mode.

Almost all the options available from Table can be implemented with the proper software to per- form the functions that are necessary for the options selected. In Table 3.1, a judgment has been made by the authors on which options are practical and which are not. What this means is that in table , an “N” should be interpreted as meaning that the option is either not practical when imple- mented with user software or that it cannot be done. An “O” is used when that function is one of several that can be implement with the GSC without additional user software.

The GSC is targeted to operate at bit rates up to 2.4 Mbps using the external clock options and up to 2 MBps using the internal baud rate generator, internal data formatting and on-chip clock recovery. The baud rate generator allows most standard rates to be achieved. These standards include the proposed IEEE802.3 LAN standard(1.0MBps) and the T1 standard (1.544Mbps). The baud rate is derived from the crystal frequency. This makes crystal selection important when determining the frequency and accuracy of the baud rate.

The user needs to be aware that after reset, the GSC is in CSMA/CD mode, IFS = 256 bit times, and a bit time equals 8 oscillator periods. The GSC will remain in this mode until the interframe space expires. If the user changes to SDLC mode or the parameters used in CSMA/CD, these changes will not take effect until the interframe space expires. A requirement for the interframe space timer to begin is that the receiver be in an idle state. This makes it possible for the GSC to

Kawasaki LSI USA, Inc. Page 36 of 120 Ver. 0.9 KS152JB2