AK61584 Datasheet, PDF (19/38 Pages) Asahi Kasei Microsystems – Dual Low Power T1/E1 Line Interface

ASAHI KASEI
[AK61584]
REGISTERS
sometime since the last read of the status register.
The control and status registers are defined in Table 5,
and are accessible in host mode. Each channel has its
own set of Status, Mask and Control. The status register
is read-only. Writing to the status register has no impact on
its contents. Interrupts are generated on the INT pin every
time a status register changes. Reading a status register
resets all bits in that status register to 0. The mask reg-
ister allows the user to mask interrupts on a status
register on a per-bit basis. The control registers select fea-
tures /functionality.
Status Registers Description
Each bit in the status register is defined below.
AIS and Latched-AIS: Indicates an all-ones condition.
AIS is set high while AIS condition is currently de-
tected. Latched-AIS indicates that a AIS condition has
occurred since the last read of the status register.
Interrupt: Indicates that the status register has changed
Latched-BPV: indicates a bipolar violation event has
been detected in the receiver sometime since the last
read of the status register. This bit is set only when the
line-code decoder is enabled.
Latched-Overflow: Indicates that a waveform generated
using the Arbitrary Waveforms has exceeded full scale
sometime since the last read of the status register.
(Optional information, refer to the Application Note.)
LOS and Latched-LOS : Indicates loss of signal
condition. LOS is set high while LOS condition is
currently detected. Latched-LOS indicates that a
LOS condition has occurred since the last read of
the status register.
Latched-reset: Indicates that a reset event
(power-up or manual) has occurred since the last read
of the status register. This status bit is not maskable.
Register
Address
h10
b0000
h11
b0001
Bit Name
Channel 1 Status
Definition
1
0
7 LOS1
LOS currently detected
6 Latched-LOS1 LOS event since last read
5 AIS1
AIS currently detected
4 Latched-AIS1 AIS event since last read
3 Latched-BPV1 BPV event since last read
2 Latched
Pulse overflow since last
-Overflow1 Read
1 Latched-reset Reset event since last read
0 Interrupt1
Interrupt event since last
Read
Channel 2 Status
no LOS
no LOS
no AIS
no AIS
no BPV
no overflow
no reset
no interrupt
7 LOS2
LOS currently detected
6 Latched-LOS2 LOS event since last read
5 AIS2
AIS currently detected
4 Latched-AIS2 AIS event since last read
3 Latched-BPV2 BPV event since last read
2 Latched
Pulse overflow since last
-Overflow2 Read
1 reserved
0 Interrupt2
Interrupt event since last
Read
Table 5(a). Status Registers
no LOS
no LOS
no AIS
no AIS
no BPV
no overflow
no interrupt
Reset
Value
1
1
0
0
0
0
1
0
1
1
0
0
0
0
0
0
0185-E-00
-19-
‘98/04