IA8X44-PLC44I-R-P03 datasheet(41/65 Pages) INNOVASIC

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IA8044/IA8344

Data Sheet

SDLC Communications Controller

March 30, 2010

IA211010112-04

http://www.Innovasic.com

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Page 41 of 65

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Table 38. Transmit Control Byte Register

TCB.7

TCB.6

TCB.5

TCB.4

TCB.3

TCB.2

TCB.1

TCB.0

4.10.9 Receive Buffer Start Address Register (RBS)

Table 39 presents the Receive Buffer Start Address Register, which contains the address in

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

should write RBS only when the SIU is not receiving a frame, RBE = 0. RBS is byte addressable.

Table 39. Receive Buffer Start Address Register

RBS.7

RBS.6

RBS.5

RBS.4

RBS.3

RBS.2

RBS.1

RBS.0

4.10.10 Receive Buffer Length Register (RBL)

Table 40 presents the Receive Buffer Length Register, which contains the length, in number of

bytes, of the I-field storage area in internal RAM. RBL = 0 is valid (no I-field). The CPU should

write RBL only when the SIU is not receiving a frame, RBE = 0. The receive buffer will not wrap

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

reached. RBL is byte addressable.

Table 40. Receive Buffer Length Register

RBL.7

RBL.6

RBL.5

RBL.4

RBL.3

RBL.2

RBL.1

RBL.0

4.10.11 Receive Field Length Register (RFL)

Table 41 presents the Receive Field Length Register, which contains the length, in number of

bytes, of the I-field of the frame received and stored in internal RAM. RFL = 0 is valid (no

I-field). The CPU should access RFL only when the SIU is not receiving a frame, RBE = 0. RFL

is loaded by the SIU. RFL is byte addressable.

Table 41. Receive Field Length Register

RFL.7

RFL.6

RFL.5

RFL.4

RFL.3

RFL.2

RFL.1

RFL.0

4.10.12 Receive Control Byte Register (RCB)

Table 42 presents the Receive Control Byte Register, which contains the control field of the frame

received and stored in internal RAM. RCB is only readable by the CPU and the CPU should

access RCB only when the SIU is not receiving a frame, RBE = 0. RCB is loaded by the SIU.

RCB is byte addressable.

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