TN8044AH-R0117 datasheet(40/65 Pages) INNOVASIC

40 / 65 page

IA8044/IA8344

Data Sheet

SDLC Communications Controller

March 30, 2010

IA211010112-04

http://www.Innovasic.com

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4.10.5 Station Address Register (STAD)

Table 35 presents the Station Address Register, which contains the station address (node address)

of the chip. The CPU can read or write STAD but should access STAD only when RTS = 0 and

RBE = 0. Normally STAD is accessed only during initialization. STAD is byte addressable.

Table 35. Station Address Register

STAD.7

STAD.6

STAD.5

STAD.4

STAD.3

STAD.2

STAD.1

STAD.0

4.10.6 Transmit Buffer Start Address Register (TBS)

Table 36 presents the Transmit Buffer Start Address Register, which contains the address in

internal RAM where the frame to be transmitted (starting with the I-field) is stored. The CPU

should access TBS only when the SIU is not transmitting a frame, TBF = 0. TBS is byte

addressable.

Table 36. Transmit Buffer Start Address Register

TBS.7

TBS.6

TBS.5

TBS.4

TBS.3

TBS.2

TBS.1

TBS.0

4.10.7 Transmit Buffer Length Register (TBL)

Table 37 presents the Transmit Buffer Length Register, which contains the length, in number of

bytes, of the I-field to be transmitted. TBL = 0 is valid (no I-field). The CPU should access TBL

only when the SIU is not transmitting a frame, TBF = 0. The transmit buffer will not wrap around

after address 191 (BFH). A buffer end is automatically generated when address 191 is reached.

TBL is byte addressable.

Table 37. Transmit Buffer Length Register

TBL.7

TBL.6

TBL.5

TBL.4

TBL.3

TBL.2

TBL.1

TBL.0

4.10.8 Transmit Control Byte Register (TCB)

Table 38 presents the Transmit Control Byte Register, which contains the byte to be placed in the

control field of the transmitted frame during non-AUTO-mode transmission. The CPU should

access TCB only when the SIU is not transmitting a frame, TBF = 0. TCB is byte addressable.

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