Nortel Networks MSC8101 ADS user manual Host I/F

Models: MSC8101 ADS

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Freescale Semiconductor, Inc.

Functional Description

to detect if a terminal is connected to the MSC8101ADS board.

DSRA ( O ) - Data Set Ready. This line is always asserted by the MSC8101ADS.

RTS ( I ) - Request To Send. This line is not connected in the MSC8101ADS.

CTS ( O ) - Clear To Send. This line is always asserted by the MSC8101ADS.

5•9

Host I/F

Host processor may be connected through 16bit-wideBbidirectional parallel port multiplexed with 32 LSBC of MSC8101 Data bus. The Host I/F will be driven after hard-reset sequence if HPE pin is sampled high at the rising edge of PORESET. Since MSC8101 Data bus has 64bit width in 60x mode to provide Host I/F disconnect additional buffers will be needed. These buffers are enabled by BCSR control line. Host Dual Data Strobe (DDS), Data Strobe Polarity (DSP), Chip Select Polarity (CSP) lines and HRRQ/HACK direction are controlled by corresponding bits of the BCSR0/1-2. See FIGURE 5-6 "Host Interface Diagram" below.

Buffer/transceivers are 5V compliant.

Host Port is also available via two row header 36 pins.

Freescale Semiconductor, Inc.

FIGURE 5-6 Host Interface Diagram

D[0:63]

 

16bit

 

 

 

 

U45

 

 

 

 

 

 

D[32:47]

 

 

 

 

 

HD[0:15]

 

E

DIR

from BCSR

 

 

O.D.

 

 

D[56]

 

 

U3

 

 

 

 

 

HACK/HRRQ

E

DIR

from BCSR control bit set once

 

D[55]

O.D.

 

U4

bus

 

 

HREQ/HTRQ

 

E

 

 

PPC

D[48:51]

 

 

U45

 

HA[0:3]

 

 

 

 

 

D[52:54]

 

 

 

 

 

HCS,HRW,HWR

E

 

 

 

D[57:60]

 

 

 

O.D.

 

 

 

PORESET

 

 

 

 

 

DSP, DDS,

 

 

 

O.D. To P2 & P4 conn.

 

8BIT

 

 

 

 

 

 

HRESET

 

Host Enable

 

 

 

 

 

DIP SW

 

 

 

 

BCSR controlled

To P2-CPM & P4-HOST conn

Presence Detect Pin (PDP)

The MSC8101 CPM ports are poorer than the MPC8260 CPM, therefore Host I/F bus may be driven outside through CPM Expansion Connector in place of unusable lines. Since the CPM Ex-

A. Since there are only 3 RS232 transmitters in the device, DSR is connected to CD.

B. 8-bit mode is also available for HDI8 I/F.

C. Really 28pins are used for Host interface.

MOTOROLA

MSC8101ADS RevB User’s Manual

53

For More Information On This Product,

Go to: www.freescale.com

Page 53
Image 53
Nortel Networks MSC8101 ADS user manual Host I/F