Rainbow Electronics DS2152 - Manual (Page 40)

DS2152
031897 40/79
TC1 TO TC24: TRANSMIT CHANNEL REGISTERS (Address=40 to 4F and 50 to 57 Hex)
(for brevity, only channel one is shown; see Table 1–3 for other register address)
(MSB) (LSB)
C7 C6 C5 C4 C3 C2 C0
SYMBOL POSITION NAME AND DESCRIPTION
C7 TC1.7 MSB of the Code (this bit is transmitted first)
C0 TC1.0 LSB of the Code (this bit is transmitted last)
TCC1/TCC2/TCC3: TRANSMIT CHANNEL CONTROL REGISTER (Address=16 to 18 Hex)
(MSB) (LSB)
CH8 CH7 CH6 CH5 CH4 CH3 CH2 CH1
CH16 CH15 CH14 CH13 CH12 CH11 CH10 CH9
CH24 CH23 CH22 CH21 CH20 CH19 CH18 CH17
SYMBOL POSITION NAME AND DESCRIPTION
CH24 TCC3.7 Transmit Channel 24 Code Insertion Control Bit
0=do not insert data from the TC1 register into the transmit data stream
1 = insert data from the TC1 register into the transmit data stream
CH1 TCC1.0 Transmit Channel 1 Code Insertion Control Bit
0=do not insert data from the TC32 register into the transmit data stream
1 = insert data from the TC32 register into the transmit data stream
8.2 RECEIVE SIDE CODE GENERATION
In the receive direction there are also two methods by
which channel data to the backplane can be overwritten
with data generated by the DS2152. The first method
which is covered in Section 8.2.1 was a feature con-
tained in the original DS2151 while the second method
which is covered in Section 8.2.2 is a new feature of the
DS2152.
8.2.1 Simple Code Insertion
The first method on the receive side involves using the
Receive Mark Registers (RMR1/2/3) to determine
which of the 24 T1 channels should be overwritten with
either a 7Fh idle code or with a digital milliwatt pattern.
The RCR2.7 bit will determine which code is used. The
digital milliwatt code is an eight byte repeating pattern
that represents a 1 KHz sine wave
(1E/0B/0B/1E/9E/8B/8B/9E). Each bit in the RMRs,
represents a particular channel. If a bit is set to a one,
then the receive data in that channel will be replaced
with one of the two codes. If a bit is set to zero, no
replacement occurs.
TC1 (50)
TCC1 (16)
TCC2 (17)
TCC3 (18)