MT90826 Mitel Networks Corporation, MT90826 Datasheet - Page 12

• Manufacturer Part Number: MT90826
• Description: Quad Digital Switch
• Manufacturer: Mitel Networks Corporation

MT90826
12
15-13
2 - 0
Bit
12
11
10
9
8
7
6
5
4
3
BPD2
15
Read/Write Address:
Reset Value:
BPD1 BPD0
BPD2-0
Unused
Unused
14
CBER
DR2-0
Name
SBER
CPLL
MBP
OSB
SFE
BPE
MS
CMOS
13
Block Programming Data. These bits carry the value to be loaded into the connection memory
block whenever the memory block programming feature is activated. After the MBP bit is set to 1
and the BPE bit is set to 1, the contents of the bits BPD2- 0 are loaded into bit 15 to bit 13 of the
connection memory. Bit 12 to bit 0 of the connection memory are set to 0.
Must be zero for normal operation.
PLL Input Frequency Select. When zero, the CLK input is 16.384MHz. When 1, the CLK input
is 8.192MHz or 16.384MHz. See Table 6 for the usage of the clock frequency.
Clear Bit Error Rate Register. A zero to one transition in this bit resets the internal bit error
counter and the bit error count register to zero.
Start Bit Error Rate Test. A zero to one transition in this bit starts the bit error rate test. The bit
error test result is kept in the bit error count register. A one to zero transition stops the bit error
rate test and the internal bit error counter.
Start Frame Evaluation. A zero to one transition in this bit starts the frame evaluation
procedure. When the CFE bit in the frame alignement (FAR) register changes from zero to one,
the evaluation procedure stops. To start another frame evaluation cycle, set this bit to zero.
Must be zero for normal operation.
Begin Block programming Enable. A zero to one transition of this bit enables the memory
block programming function. The BPE and BPD2-0 bits have to be defined in the same write
operation. Once the BPE bit is set high, the device requires two frames to complete the block
programming. After the programming function has finished, the BPE bit returns to zero to
indicate the operation is completed. When the BPE = 1, the BPE or MBP can be set to 0 to abort
the programming operation.
When BPE = 1, the other bits in the control register must not be changed for two frames to
ensure proper operation.
Memory Block Program. When 1, the connection memory block programming feature is ready
to program Bit13 to Bit15 of the connection memory. When 0, feature is disabled.
Memory Select. When 0, connection memory is selected for read or write operations. When 1,
the data memory is selected for read operations and connection memory is selected for write
operations. (No microprocessor write operation is allowed for the data memory.)
For data memory read operations, two consecutive microprocessor cycles are required. The
read address should remain the same for the two consecutive read cycles. The data memory
content from the first read cycle should be ignored. The correct data memory content will be
presented to the data bus on the second read cycle.
Output Stand By. This bit controls the device output drivers.
Data Rate Select. Input/Output data rate selection. See next table (Table 6) for detailed
programming.
12
0
OSB bit ODE pin OE bit
0
1
1
0
X
CPLL
11
0000
0000
CBER
10
Table 5 - Control Register Bits
X
1
0
1
0
H
H
,
.
SBER
9
0
1
1
1
X
SFE
8
STo0 - 31
High impedance state
Per-channel high impedance
Enable
Enable
Enable
0
7
Description
BPE
6
MBP
5
MS
4
Advanced Information
OSB
3
DR2
2
DR1
1
DR0
0