MK50H25DIP datasheet(30/64 Pages) STMICROELECTRONICS

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Table 3: Address and Control Field Handling By The MK50H25 Receiver In Transparent Mode

DACE

PROM

EXTA

EXTAF

EXTC

EXTCF

Address Field Handling

A filtered

A or EA filtered

EA filtered

A or EA filtered

EA filtered

Not filtered, AA -> MEM1

Not filtered, AA ->MEM1

Not filtered, AA or EA -> MEM1

Not filtered, EA -> MEM1

Not filtered, AA or EA -> MEM1

First 2 octets always filtered

Total transparent mode

Control Field Handling

CC -> MEM1

CC or EC -> MEM1

CC -> MEM1

CC or EC -> MEM1

EC -> MEM1

CC -> MEM2

CC or EC -> MEM2

CC -> MEM2

EC -> MEM2

EC -> MEM1

All data after opening flag &

before FCS -> memory

NOTES:

1. MEM1 is the first location and MEM2 is the second location where received data is loaded. MEM1 and MEM2 are

each 16 bits wide.

2. C is the received, single octet, control field. CC ->MEMx means the single octet control field C is loaded into both

bytes of a 16 bit memory location. Similarly, A is a single octet address field, and AA ->MEMx means the single octet

address field A is loaded into both bytes of a 16 bit memory location.

3. EC is an extended control field (2 octets). If EXTC=1 and either of the 2 LSB’s of the control filed is 0, the control field

is considered extended, This determines whether CC or EC ->MEMx. However, when EXTCF is set to 1, the control

field is always extended

4. EA is an extended address field (2 octets). ”A or EA filtered” means that one octet of the A-field is filtered if the LSB =

1, or two octets are filtered if the LSB = 0. Similarly ”AA or EA -> MEM1” means that AA is loaded into memory if the

LSB = 0; else, EA is loaded. This conforms to HDLC rules for extended address. However, if EXTAF is set to 1, two

octets are filtered regardless of the LSB, and EA will be loaded into memory.

5. .PROM is defined in CSR2 bit 10.

6. DACE, EXTA, EXTAF, EXTC, and EXTCF are as defined in the Mode register. X = Do not care.

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