mt9075bpr1 Zarlink Semiconductor, mt9075bpr1 Datasheet - Page 18

• Manufacturer Part Number: mt9075bpr1
• Description: E1 Single Chip Transceiver With Liu
• Manufacturer: Zarlink Semiconductor

Identification Code
The MT9075B shall be identified by the code 10101010, read from the identification code status register (page 03H,
address 1FH).
Reset Operation (Initialization)
The MT9075B can be reset using the hardware RESET pin (pin 11 in PLCC, pin 84 in MQFP, see pin description
for external reset circuit requirements) or the software reset bit RST (page 01H, address 11H). When the device
emerges from its reset state it will begin to function with the default settings described in Table 6. A reset
operation takes 1 full frame (125 us) to complete.
Transmit AIS Operation
The pin TAIS (Transmit AIS, pin 60 in PLCC, pin 48 in MQFP) allows an all ones signal to be transmitted from the
point of power-up without the need to write any control registers. During this time the IRQ pin is tristated. After the
interface has been initialized normal operation can take place by making TAIS high.
National Bit Buffers
Table 7 shows the contents of the transmit and receive Frame Alignment Signals (FAS) and Non-frame Alignment
Signals (NFAS) of time slot zero of a PCM 30 signal. Even numbered frames (CRC Frame # 0, 2, 4,...) are FASs
and odd numbered frames (CRC Frame # 1, 3, 5,...) are NFASs. The bits of each channel are numbered 1 to 8, with
bit 1 being the most significant and bit 8 the least significant.
Transmit MFAS (CAS)
Per Time Slot Control
ABCD Bit Debounce
Tx Message Buffer
Transmit non-FAS
CRC Interworking
Error Insertion
Transmit FAS
RxMF Output
Loopbacks
Signalling
Function
Data Link
Interrupts
Counters
HDLCs
Buffer
Mode
Table 6 - Reset Status
Zarlink Semiconductor Inc.
MT9075B
18
interrupts not suspended
All locations set to 54H
Signalling Multiframe
Interrupt Mask Word
All locations cleared
Zero unmasked, all
others masked;
CAS Registers
1/S
Deactivated
Deactivated
Deactivated
Deactivated
Deactivated
Termination
C
00001111
Activated
n
Cleared
Status
0011011
n
1111111
Data Sheet