MK50H25(1994) 查看數據表（PDF） - STMicroelectronics
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MK50H25 Datasheet PDF : 64 Pages
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MK50H25
Table 3: Address and Control Field Handling By The MK50H25 Receiver In Transparent Mode
DACE PROM EXTA EXTAF EXTC EXTCF Address Field Handling
Control Field Handling
0
0
0
0
0
0 A filtered
CC -> MEM1
0
0
0
0
1
0 A filtered
CC or EC -> MEM1
0
0
1
0
0
0 A or EA filtered
CC -> MEM1
0
0
1
1
0
0 EA filtered
CC -> MEM1
0
0
1
0
1
0 A or EA filtered
CC or EC -> MEM1
0
0
1
1
1
1 EA filtered
EC -> MEM1
0
1
0
0
0
0 Not filtered, AA -> MEM1
CC -> MEM2
0
1
0
0
1
0 Not filtered, AA ->MEM1
CC or EC -> MEM2
0
1
1
0
0
0 Not filtered, AA or EA -> MEM1 CC -> MEM2
0
1
1
1
0
0 Not filtered, EA -> MEM1
CC -> MEM2
0
1
1
0
1
1 Not filtered, AA or EA -> MEM1 EC -> MEM2
1
0
X
X
X
X First 2 octets always filtered
EC -> MEM1
1
1
X
X
X
X Total transparent mode
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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