mk50h27 STMicroelectronics, mk50h27 Datasheet - Page 15

• Manufacturer Part Number: mk50h27
• Description: Signalling System 7 Link Controller
• Manufacturer: STMicroelectronics

4.1.1.2 Register Data Port (RDP)
4.1.2 Control and Status Register Definition
4.1.2.1 Control and Status Register 0 (CSR0)
RAP<3:1> = 0
15:00
15
14
13
BIT
BIT
NAME
TDMD
POFF
DTX
CSR DATA
NAME
1
5
1
5
T
D
M
D
1
4
1
4
P
O
F
F
1
3
1
3
D
T
X
Writing data to the RDP loads data into the CSR selected by RAP. Reading the data from
RDP reads the data from the CSR selected in RAP.
1
2
1
2
D
R
X
Transmit Descriptor Ring without waiting for the transmit polltime inter-
val to elapse. TDMD need not be set to transmit a MSU, it merely has-
tens MK50H27’s response to a Transmit Descriptor Ring entry inser-
tion by the host. TDMD is Write With ONE ONLY and cleared by the
microcode after it is used. It may read as a ”1” for a short time after it
is written because the microcode may have been busy when TDMD
was set. It is also cleared by Bus RESET. Writing a ”0” in this bit has
no effect.
phase of operation. All external activity is disabled and internal logic is
reset. MK50H27 remains inactive except for primitive processing until
a Power On primitive is issued. POFF IS READ ONLY and set by Bus
RESET or a Power Off primitive. Writing to this bit has no effect.
the Transmitter Descriptor Ring and terminates transmitter polling. No
transmissions are attempted after finishing transmission of any signal
unit in transmission at the time of DTX being set. TXON acknow-
ledges changes to DTX, see below. DTX is READ/WRITE.
DESCRIPTION
TRANSMIT DEMAND, when set, causes MK50H27 to access the
POFF, when set, indicates that MK50H27 is operating in the Power Off
Transmitter ring disable prevents the MK50H27 from further access to
1
1
1
1
T
X
O
N
1
0
1
0
R
X
O
N
CSR
0
9
0
9
I
N
E
A
0
8
0
8
I
N
T
R
0
7
0
7
M
E
R
R
DATA
DESCRIPTION
0
6
0
6
M
I
S
S
0
5
0
5
R
O
R
0
4
0
4
T
U
R
0
3
0
3
P
I
N
T
0
2
0
2
T
I
N
T
0
1
0
1
R
I
N
T
0
0
0
0
0
MK50H27
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