DS2152LN Maxim Integrated Products, DS2152LN Datasheet - Page 52

• Manufacturer Part Number: DS2152LN
• Description: Network Controller & Processor ICs
• Manufacturer: Maxim Integrated Products

Specifications of DS2152LN

• Product: Framer
• Number Of Transceivers: 1
• Data Rate: 2.048 Mbps
• Supply Voltage (max): 5.25 V
• Supply Voltage (min): 4.75 V
• Supply Current (max): 75 mA
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Package / Case: LQFP-100
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

9.2 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 9.2.1, was
a feature contained in the original DS2151, while the second method, which is covered in Section 9.2.2, is
a new feature of the DS2152.
9.2.1 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 8-byte
repeating pattern that represents a 1kHz 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 1, then the receive data in that channel will be replaced
with one of the two codes. If a bit is set to 0, no replacement occurs.
RMR1/RMR2/RMR3: RECEIVE MARK REGISTERS (Address = 2D to 2F Hex)
9.2.2 Per-Channel Code Insertion
The second method involves using the Receive Channel Control Registers (RCC1/2/3) to determine
which of the 24 T1 channels off the T1 line and going to the backplane should be overwritten with the
code placed in the Receive Channel Registers (RC1 to RC24). This method is more flexible than the first
in that it allows a different 8-bit code to be placed into each of the 24 T1 channels.
RC1 TO RC24: RECEIVE CHANNEL REGISTERS
(Address = 58 to 5F and 80 to 8F Hex)
(For brevity, only channel 1 is shown; see
(MSB)
(MSB)
CH16
CH24
CH8
C7
SYMBOL
SYMBOL
CH24
CH1
C7
C0
CH15
CH23
CH7
C6
POSITION
POSITION
RMR3.7
RMR1.0
CH14
CH22
RC1.7
RC1.0
CH6
C5
CH13
CH21
CH5
Table 2-1
C4
NAME AND DESCRIPTION
NAME AND DESCRIPTION
Receive MARK Registers.
0 = do not affect the receive data associated with this channel
1 = replace the receive data associated with this channel with
either the idle code or the digital milliwatt code (depends on the
RCR2.7 bit)
MSB of the Code (this bit is sent first to the backplane)
LSB of the Code (this bit is sent last to the backplane)
for other register address.)
CH12
CH20
CH4
52 of 97
C3
CH11
CH19
CH3
C2
CH10
CH18
CH2
C1
CH17
CH1
CH9
C0
(LSB)
(LSB)
RMR1(2D)
RMR2(2E)
RMR3(2F)
RC1 (58)