XRT84L38IB Exar Corporation, XRT84L38IB Datasheet - Page 185

• Manufacturer Part Number: XRT84L38IB
• Description: Network Controller & Processor ICs 8 Ch T1/E1 Framer
• Manufacturer: Exar Corporation

Specifications of XRT84L38IB

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

REV. 1.0.1
be to isolate the source of the interrupt request down to the device level (e.g, the Framer IC), if multiple
peripheral ICs exist in the user's system. However, once the interrupting peripheral device has been identified,
the next task for the μ P/ μ C is to determine exactly what feature of functional section within the device
requested the interrupt.
Determine the Framer(s) Requesting the Interrupt
If the interrupting device turns out to be the Framer, then the μ P/ μ C must determine which of the eight framer
channels requested the interrupt. Hence, upon reaching this state, one of the very first things that the μ P/ μ C
must do within the user Framer interrupt service routine, is to perform a read of each of the Block Interrupt
Status Registers within all of the Framer channels that have been enabled for Interrupt Generation via their
respective Interrupt Control Registers.
Table 26
channels within the Framer.
The bit-format of each of these Block Interrupt Status Registers is listed below.
lists the Indirect Address for the Block Interrupt Status Registers associated with each of the Framer
T
ABLE
26: A
N
F
RAMER
UMBER
0
1
2
3
4
5
6
7
DDRESS OF THE
A
DDRESS OF
B
LOCK
165
B
0x0A, 0x02
0x1A, 0x02
0x2A, 0x02
0x3A, 0x02
0x4A, 0x02
0x5A, 0x02
0x6A, 0x02
0x7A, 0x02
LOCK
R
EGISTER
I
NTERRUPT
I
NTERRUPT
S
TATUS
S
TATUS
R
EGISTERS
OCTAL T1/E1/J1 FRAMER
XRT84L38