DS2155 datasheet(137/262 Pages) DALLAS

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DS2156

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22.3 HDLC Mapping

22.3.1 Receive

The HDLC controllers must be assigned a space in the T1/E1 bandwidth in which they 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:

Channels

HxRCS1

1–8

HxRCS2

9–16

HxRCS3

17–24

HxRCS4

25–32

H1RCS1, H1RCS2, H1RCS3, H1RCS4

H2RCS1, H2RCS2, H2RCS3, H2RCS4

HDLC # 1 Receive Channel Select x

HDLC # 2 Receive Channel Select x

92h, 93h, 94h, 95h

A2h, A3h, A4h, A5h

Bit #

Name

RHCS7

RHCS6

RHCS5

RHCS4

RHCS3

RHCS2

RHCS1

RHCS0

Default

Bit 0/Receive HDLC Channel Select Bit 0 (RHCS0). Select Channel 1, 9, 17, or 25.

Bit 1/Receive HDLC Channel Select Bit 1 (RHCS1). Select Channel 2, 10, 18, or 26.

Bit 2/Receive HDLC Channel Select Bit 2 (RHCS2). Select Channel 3, 11, 19, or 27.

Bit 3/Receive HDLC Channel Select Bit 3 (RHCS3). Select Channel 4, 12, 20, or 28.

Bit 4/Receive HDLC Channel Select Bit 4 (RHCS4). Select Channel 5, 13, 21, or 29.

Bit 5/Receive HDLC Channel Select Bit 5 (RHCS5). Select Channel 6, 14, 22, or 30.

Bit 6/Receive HDLC Channel Select Bit 6 (RHCS6). Select Channel 7, 15, 23, or 31.

Bit 7/Receive HDLC Channel Select Bit 7 (RHCS7). Select Channel 8, 16, 24, or 32.

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