DS26303LN-75+ Maxim Integrated Products, DS26303LN-75+ Datasheet - Page 21

• Manufacturer Part Number: DS26303LN-75+
• Description: IC LIU E1/T1/J1 3.3V 144-ELQFP
• Manufacturer: Maxim Integrated Products
• Type: Line Interface Units (LIUs)r

Specifications of DS26303LN-75+

• Number Of Drivers/receivers: 8/8
• Protocol: T1/E1/J1
• Voltage - Supply: 3.135 V ~ 3.465 V
• Mounting Type: Surface Mount
• Package / Case: 144-LQFP Exposed Pad, 144-eLQFP, 144-HLQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

4.1.2 Serial Port Operation
Setting MODESEL = VDDIO/2 enables the serial bus interface on the DS26303. Port read/write timing is unrelated
to the system transmit and receive timing, allowing asynchronous reads or writes by the host. See Section
the AC timing of the serial port. All serial port accesses are LSB first. See
This port is compatible with the SPI interface defined for Motorola processors. An example of this is Motorola’s
MMC2107.
Reading or writing to the internal registers requires writing one address/command byte prior to transferring register
data. The first bit written (LSB) of the address/command byte specifies whether the access is a read (1) or a write
(0). The next 5 bits identify the register address (A1 to A5; A6 and A7 are ignored).
All data transfers are initiated by driving the CSB input low. When CLKE is low, SDO data is output on the rising
edge of SCLK and when CLKE is high, data is output on the falling edge of SCLK. Data is held until the next falling
or rising edge. All data transfers are terminated if CSB input transitions high. Port control logic is disabled and SDO
is tri-stated when CSB is high. SDI is always sampled on the rising edge of SCLK.
Figure 4-2. Serial Port Operation for Write Access
Figure 4-3. Serial Port Operation for Read Access with CLKE = 0
SCLK
CSB
SDI
SDI
CSB
SDO
SDO
(lsb)
SCLK
WRITE ACCESS ENABLED
0
1
Read
Access
Enabled
0
(lsb)
1
A1
2
A1
2
A2
3
A2
3
A3
4
A3
4
A4
5
A4
5
A5
6
A5
6
A6
7
A6
7
(msb)
DS26303: 3.3V, T1/E1/J1, Short-Haul, Octal Line Interface Unit
21 of 101
X
(msb)
8
X
8
DO
(lsb)
9
9
D0
(lsb)
10
D1
10
D1
D2
11
11
D2
Figure 4-2
D3
12
12
D3
D4
13
13
D4
to
D5
Figure
14
14
D5
D6
15
4-4.
15
D6
(msb)
D7
16
(msb)
16
D7
10.3
for