DS3170 Maxim Integrated Products, DS3170 Datasheet - Page 76

• Manufacturer Part Number: DS3170
• Description: Network Controller & Processor ICs DS3-E3 Single-Chip T ransceiver T3-E3 Fra
• Manufacturer: Maxim Integrated Products

long. The generated BERT signal replaces the data on the TSER pin in framed modes when the BERT is enabled
by setting the PORT.CR1.BENA.
When the BERT is enabled The TDEN and RDEN pins will still be active but the data on the TSER pin will be
discarded.
10.5.8 System Port Pins
The system port pins have multiple functions based on the framing mode the device is in as well as other pin mode
select bits.
10.5.8.1 Transmit System Port Pins
The transmit system pins are TSOFI, TSER, TSOFO / TDEN, and TCLKO / TGCLK. They have different functions
based on the framing mode and other pin mode bits. Unused input pin functions should drive a logic zero into the
device circuits expecting a signal from that pin. The control bits that configure the pins’ modes are
PORT.CR2.FM[2:0], PORT.CR3.TPFPE, PORT.CR3.TSOFOS and PORT.CR3.TCLKS.
Table 10-20
multiplexed pins.
Table 10-20. TSOFI Input Pin Functions
Table 10-21. TSOFO/TDEN/Output Pin Functions
Table 10-22 TCLKO/TGCLK Output Pin Functions
10.5.8.2 Receive System Port Pins
The receive system pins are RSER, RSOFO / RDEN and RCLKO / RGCLK. They have different functions based
on the framing mode and other pin mode bits. Unused input pin functions should drive a logic zero into the device
circuits expecting a signal from that pin. The control bits that configure these pins are PORT.CR2.FM[2:0],
PORT.CR3.RPFPE, PORT.CR3.RSOFOS and PORT.CR3.RCLKS.
Table 10-23
multiplexed pins.
1XX (UFRM)
PORT.CR2
0XX (FRM)
0XX (FRM)
1XX (UFRM)
1XX (UFRM)
PORT.CR2
0XX (FRM)
PORT.CR2
0XX (FRM)
0XX (FRM)
FM[2:0]
FM[2:0]
FM[2:0]
to
to
Table 10-22
Table 10-24
PORT.CR3
TCLKS
PORT.CR3
TSOFOS
FUNCTION
X
0
1
Not used
TSOFI
X
0
1
PIN
describe the function selected by the FM bits and other pin mode bits for the
describe the function selected by the FM bits and other pin mode bits for the
FUNCTION
FUNCTION
TGCLK
TCLKO
TCLKO
TSOFO
PIN
TDEN
High
PIN
76 of 230
GAP SOURCE
TDEN
none
none
DS3170 DS3/E3 Single-Chip Transceiver