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								D1					1	40				D0																						AD1					1	40				AD0
								D3					2	39				D2																						AD3					2	39				AD2
								D5					3	38				D4																						AD5					3	38				AD4
								D7					4	37				D6																						AD7					4	37				AD6
								INT					5	36																											INT				5	36
																		RD																																DS
							IEO						6	35																										IEO					6	35
																		WR																																AS
								IEI					7	34																											IEI				7	34
																		A/B																																R/W
													8																																8
			INTACK											33																						INTACK										33
																		CE																																CS0
							+5v						9	32																										+5v					9	32				CS1
																		D/C
													10	Z85C30 31																															10	Z80C30 31
					W/REQA													GND																					W/REQA											GND
			SYNCA										11	30																						SYNCA									11	30
																			W/REQB																																W/REQB
				RTxCA									12	29																								RTxCA							12	29
																		SYNCB																																SYNCB
							RxDA						13	28				RTxCB																						RxDA					13	28				RTxCB
													14																																14
				TRxCA										27				RxDB																			TRxCA									27				RxDB
							TxDA						15	26																										TxDA					15	26
																		TRxCB																																TRxCB
													16																																16
	DTR/REQA													25				TxDB																DTR/REQA												25				TxDB
													17																																17
							RTSA							24				DTR/REQB																						RTSA						24				DTR/REQB
						CTSA							18	23				RTSB																					CTSA						18	23
																																																		RTSB
						DCDA							19	22																									DCDA						19	22
																		CTSB																																CTSB
							PCLK						20	21																										PCLK					20	21
																		DCDB																																DCDB

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								6		5		4		3		2		1	44 43				42 41 40
				IEO				7																					39
				IEI				8																					38
INTACK								9																					37
				+5V				10																					36
								11																					35
			W/REQA													Z85C30
	SYNCA							12																					34
		RTxCA						13																					33
				RxDA				14																					32
		TRxCA						15																					31
				TxDA				16																					30
				NC				17																					29
								18 19 20 21 22 23 24 25 26 27 28
									NC		DTR/REQA		RTSA		CTSA		DCDA	PCLD		DCDB		CTSB		RTSB		DTR/REQB				NC

INT

AD7

AD5

AD3

AD1

AD0

AD2

AD4

AD6

DS

AS

6

5

4

3

2

1

44 43

42 41 40

A/B

IEO

7

39

R/W

IEI

8

38

CE

CS0

D/C

INTACK

9

37

CS1

NC

+5V

10

36

NC

11

35

GND

W/REQA

Z80C30

GND

W/REQB

SYNCA

12

34

W/REQB

SYNCB

RTxCA

13

33

SYNCB

RxDA

RTxCB

14

32

RTxCB

RxDB

TRxCA

15

31

RxDB

TxDA

TRxCB

16

30

TRxCB

TxDB

NC

17

29

TxDB

18 19 20 21 22 23 24 25 26 27 28

NC

DTR/REQA

RTSA

CTSA

DCDA

PCLK

DCDB

CTSB

RTSB

DTR/REQB

NC

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Bus Timing

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Control

Interrupt

	D7		TxDA	Serial
			RxDA
	D6			Data
	D5		TRxCA	Channel
			RTxCA
	D4			Clocks
	D3		SYNCA
				CH-A
	D2	W/REQA
				Channel
	D1	DTR/REQA		Controls
				for Modem,
			RTSA
	D0			DMA and
	RD		CTSA	Other
	WR	Z85C30	DCDA
	A/B		TxDB	Serial
	CE		RxDB	Data
	D/C		TRxCB	Channel
	INT		RTxCB	Clocks
	INTACK		SYNCB
				CH-B
	IEI	W/REQB
				Channel
	IEO	DTR/REQB
				Controls
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				Other
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Control

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			RxDA
	AD6			Data
	AD5		TRxCA	Channel
			RTxCA
	AD4			Clocks
	AD3		SYNCA
				CH-A
	AD2	W/REQA
				Channel
	AD1	DTR/REQA		Controls
				for Modem,
			RTSA
	AD0			DMA and
	AS		CTSA	Other
	DS	Z80C30	DCDA
	R/W		TxDB	Serial
	CS1		RxDB	Data
	CS0		TRxCB	Channel
	INT		RTxCB	Clocks
	INTACK		SYNCB
				CH-B
	IEI	W/REQB
				Channel
	IEO	DTR/REQB
				Controls
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				Other
			DCDB

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Internal TXD

TX Buffer

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WR6

WRB

1 Byte

SYNC

Register

SYNC

Register

Final TX

TXD

20-Bit TX Shift Register

MUX

	Sync
Zero Insert	Sync	Transmit	NRZ
	SDLC	MUX & 2-Bit	Encode
(5 Bits)		Delay
CRC-Gen		Transmit Clock

From Receiver

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Internal Data Bus

Upper Byte (WR13)

Lower Byte (WR12)

Time Constant

Time Constant

BRG

BRG

16-Bit Down Counter

DIV 2

Input

Output

Status FIFO

10 X 19 Frame

Rec. Error FIFO

3 Byte Deep

Rec. Error FIFO

3 Byte Deep

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						Hunt Mode (BISYNC)
DPLL			DPLL	SYNC Register			Receive Shift
IN		DPLL				3-Bit
			OUT	& Zero Delete			Register
		Internal TXD
							CRC Delay
RXD	1-Bit	MUX	NRZI Decode		MUX		Register (8 bits)	SYNC
								CRC
						SDLC-CRC	CRC
				To Transmit Section			Checker	CRC Result

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