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DDR (DDR0, DDR1), DVRH, DVRL, DDX0, DDX1
Related register name:
P_RST, PBXMD, PBXIF, D_RST, DPTMD, DPTIF
With a 512Kbps ping-pong transmission (AMI encoding) interface, a transmission band of 2B (64kbps x 2) + D (16Kbps) +C
(8Kbps) is ensured. It also has the following functions: clock extraction through digital PLL, synchronization switching, DPT
interface, transmitted pulse width programmability, and receiving edge position programmability.
• • • • Transmission frame format
The frame format on the transmission path is as shown in Fig.3-4: Frame timing; and transmissions are performed for each bit
shown in Table 3-1: Information field explanation table. Receiving operation from the PBX is performed, and after 1 bit time has
elapsed transmission operation is performed. After the parity bit is transmitted, an idle time of 7 bit times is commenced.
One bit time is 512KHz (1.95µs), and the information encoding used is AMI.
Field name
Bit number
SYNC
MAM
C
D
B1
B2
P
Voltage Level
PDR
+1.75V
0V
+3.3V
-
PDX0,PDX1,DDR0,DDR1,DDX0 and DDX1 performs similar controls.
Table 3-1: Information Field Explanation
5
Continuous [00000] pattern; used for clock extraction by PLL.
3
A [000] pattern (01-01-10) violating the AMI encoding side; used to detect the header of the
received frame.
1
Valid data inverted from B1 channel.
2
Valid data inverted from B2 channel
8
Parity data, transmitted to PDX0/DDX0 line and PDX1/DDX1 line.Parity is added so that the
number of 0 patterns becomes equal.Combined with bit ensuring direct current balance on the
line.
8
Continuous [00000] pattern; used for clock extraction by PLL.
1
A [000] pattern (01-01-10) violating the AMI encoding side; used to detect the header of the
received frame.
Table 3-2: AMI Encoding Rules
Normal (PACT=0)
PDR0
PDR1
1
1
1
0
0
1
0
0
Explanation
2
Inversion (PACT=1)
PDR0
PDR1
0
0
0
1
1
0
1
1
129
KX-TVM200E / KX-TVM200NE
Information Bit
1
0
0
Prohibited
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