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DS21Q55

22.3 HDLC Mapping

22.3.1 Receive

The HDLC controllers need to be assigned a space in the T1/E1 bandwidth in which they will transmit and receive data. The controllers can be mapped to either the FDL (T1), Sa bits (E1), or to channels. If mapped to channels, then any channel or combination of channels, contiguous or not, can be assigned to an HDLC controller. When assigned to a channel(s) any combination of bits within the channel(s) can be avoided.

The HxRCS1–HxRCS4 registers are used to assign the receive controllers to channels 1–24 (T1) or 1–32 (E1) according to the following table.

REGISTER

CHANNELS

HxRCS1

1–8

HxRCS2

9–16

HxRCS3

17–24

HxRCS4

25–32

Register Name:H1RCS1, H1RCS2, H1RCS3, H1RCS4

H2RCS1, H2RCS2, H2RCS3, H2RCS4

Register Description: HDLC # 1 Receive Channel Select x

HDLC # 2 Receive Channel Select x

Register Address:92h, 93h, 94h, 95h

A2h, A3h, A4h, A5h

Bit #

Name

Default

7

6

5

4

3

2

1

0

RHCS7

RHCS6

RHCS5

RHCS4

RHCS3

RHCS2

RHCS1

RHCS0

0

0

0

0

0

0

0

0

Bit 0/Receive HDLC Channel Select Bit 0 (RHCS0). Bit 1/Receive HDLC Channel Select Bit 1 (RHCS1). Bit 2/Receive HDLC Channel Select Bit 2 (RHCS2). Bit 3/Receive HDLC Channel Select Bit 3 (RHCS3). Bit 4/Receive HDLC Channel Select Bit 4 (RHCS4). Bit 5/Receive HDLC Channel Select Bit 5 (RHCS5). Bit 6/Receive HDLC Channel Select Bit 6 (RHCS6). Bit 7/Receive HDLC Channel Select Bit 7 (RHCS7).

Select Channel 1, 9, 17, or 25. Select Channel 2, 10, 18, or 26. Select Channel 3, 11, 19, or 27. Select Channel 4, 12, 20, or 28. Select Channel 5, 13, 21, or 29. Select Channel 6, 14, 22, or 30. Select Channel 7, 15, 23, or 31. Select Channel 8, 16, 24, or 32.

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information.

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Maxim DS21Q55 specifications Hdlc Mapping, Receive, Register Channels, H2RCS1, H2RCS2, H2RCS3, H2RCS4