STLC5464 datasheet(64/83 Pages) STMICROELECTRONICS

64 / 83 page

VIII.14 - HDLC Receive Command Register - HRCR (1A)H

bit15

bit8

bit7

bit 0

CH4

CH3

CH2

CH1

CH0

READ

AR21

AR20

AR11

AR10

CRC

After reset (0000)H

READ : READ COMMAND MEMORY

READ = 1, READ COMMAND MEMORY.

READ = 0, WRITE COMMAND MEMORY.

CH0/4 : These five bits define one of 32 channels.

C1/C0 : COMMAND

Commands Bits

ABORT ; if this command occurs during receiving a current frame, HDLC Controller stops the

reception, generates an interrupt and waits new command such as START orn CONTINUE.

If this command occurs after receiving a frame, HDLC Controller generates an interrupt and waits

a new command such as START or CONTINUE.

START ; Rx DMA Controller is now going to transfer first frame into buffer related to the initial

descriptor. The initial descriptor address is provided by the Initiate Block located in external

memory.

CONTINUE ; Rx DMA Controller is now going to transfer next frame into buffer related to next

descriptor. The next descriptor address is provided by the previous descriptor from which the

related frame had been already received.

HALT ; after receiving frame, HDLC Controller stops the reception, generates an interrupt and

waits a new command such as START or CONTINUE.

P0/1

: PROTOCOL BITS

Transmission Mode

HDLC

Transparent Mode 1 (per byte) ; the fill character defined in FCR Register is taken into account.

Transparent Mode 2 (per byte) ; the fill character defined in FCR Register is not taken into account.

Reserved

CRC

: CRC stored in external memory

CRC = 1, the CRC is stored at the end of the frame in external memory.

CRC = 0, the CRC is not stored into external memory.

AR10

: Address Recognition10

AR10 = 1, First byte after opening flag of received frame is compared to AF0/7 bits of AFRDR.

If the first byte received and AF0/7 bits are not identical the frame is ignored.

AR10 = 0, First byte after opening flag of receivedframe is not compared to AF0/7 bits of AFRDR

AR11

: Address Recognition 11

AR11 = 1, First byte after opening flag of received frame is compared to all ”1”s.If the first byte

received is not all ”1”s the frame is ignored.

AR11 = 0, First byte after opening flag of received frame is not compared to all ”1”s.

AR20

: Address Recognition 20

AR20 = 1, Secondbyte after opening flag of received frame is comparedto AF8/15bits of AFRDR

AR20 = 0, Second byte after opening flag of received frame is not compared to AF8/15 bits of

AFRDR Register.

VIII - INTERNAL REGISTERS (continued)

STLC5464

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