DS26303G-120 MAXIM [Maxim Integrated Products], DS26303G-120 Datasheet - Page 21

• Manufacturer Part Number: DS26303G-120
• Description: 3.3V, E1/T1/J1, Short-Haul, Octal Line Interface Unit
• Manufacturer: MAXIM [Maxim Integrated Products]

4.1
4.1.1 Hardware Mode
The DS26303 supports a hardware configuration mode that allows the user to configure the device through setting
levels on the device’s pins. This mode allows the configuration of the DS26303 without the use of a
microprocessor. Not all of the device features are supported in the hardware mode. To see all available options for
this hardware mode, see the pin descriptions in
The following table provides two basic examples of configurations available in hardware mode by setting pins.
Table 4-2. Hardware Mode Configuration Examples
HARDWARE
PIN NAME,
RRING[8:1]
scan_mode
TRING[8:1]
RNEG[8:1]
MODESEL
TNEG[8:1]
RPOS[8:1]
TPOS[8:1]
RCLK[8:1]
TCLK[8:1]
RIMPOFF
GMC[3:0]
TTIP[8:1]
RTIP[8:1]
RLOS
RIMPMS
TIMPRM
JTRSTB
TS[2:0]
LP[8:1]
JTCLK
MODE
CODE
MCLK
CLKE
JTMS
JTDO
RSTB
CLKA
INTB
JTDI
JAS
OE
Hardware and Host Port Operation
[8:1]
N.C.: Pulled to VDDIO/2
N.C.: Pulled to VDDIO/2
Output: 1.544MHz
Input: 1.544MHz
Input: 1.544MHz
Input, Pulled Up
Input, Pulled Up
Output, High-Z
Input, Pullup
STANDARD MODE CONFIGURATION
Output
Output
Output
Output
Output
Input
Input
Input
Input
0000
Input
Input
N.C.
N.C.
111
T1
0
0
1
0
0
1
0
0
Table
(Part number ends in –75)
N.C.: Pulled to VDDIO/2
N.C.: Pulled to VDDIO/2
Output: 2.048MHz
DS26303: 3.3V, T1/E1/J1, Short-Haul, Octal Line Interface Unit
Input: 2.048MHz
Input: 2.048MHz
Input, Pulled Up
Input, Pulled Up
Output, High-Z
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4-1.
Input, Pullup
Output
Output
Output
Output
Output
Input
Input
Input
Input
0000
Input
Input
N.C.
N.C.
000
E1
0
0
1
0
0
1
0
0
—
—
—
—
—
—
—
—
—
—
Used as recovery clock.
Meets T1.231 and ITU G.775.
Low for hardware mode.
100W for T1 mode/75W E1 mode.
AMI endocoding/decoding.
Jitter attenuator is not used.
Set template T1 (655ft)-100W/E1-75W.
Receive impedance should default to
on.
Not used in hardware mode.
Internally pulled to VDDIO/2.
Internal impedance mode selected.
No monitoring enabled.
TTIP and TRING are outputs.
RPOSn/RNEGn are clocked on rising
edge.
JTAG.
Reset.
Not available in hardware node.
Pull low or ground. Used only in factory
test.
NOTES