T-8110L AGERE [Agere Systems], T-8110L Datasheet - Page 77

• Manufacturer Part Number: T-8110L
• Manufacturer: AGERE [Agere Systems]

February 2004
Agere Systems Inc.
7 Frame Group and FG I/O
7.4 FG Circuit Operation
Each of the eight frame group signals FG[7:0] operate independently and have multiple uses. Refer to Figure 13
below.
!
!
!
!
!
As programmable 8 kHz frame reference outputs (frame group)
As general-purpose register I/O bits (FGIO)
As a programmable timer (FG7 only)
As external interrupt input signals
As diagnostic observation points for internal testpoints
FGIO
FG
FG
FG
LOWER START
ADDR
T8110L
INTERNAL FRAME
FROM FG6 INPUT
FG7 MODE
FG7 COUNTER
HI/LO BYTE
FGIO DATA REGISTER
WRITES FROM REGISTER
ACCESS INTERFACE
FGIO DATA REGISTER
READS TO REGISTER
ACCESS INTERFACE
FGIO
FG AS EXTERNAL INTERRUPT
TO INTERRUPT CONTROLLER
X
X
X
RATE
WIDTH
UPPER/
X
X
R/W
READ MASK
DETECT
OFFSET
TESTPOINT DIAGNOSTIC CONTROL
T8110L TESTPOINTS
(continued)
Figure 13. FG[7:0] Functional Paths
MASTER ENABLE REGISTER (0x00103)
PROGRAMMABLE
GENERATOR
(FG7 ONLY)
DATA REG
PULSE
TIMER
FGIO
X
Ambassador T8110L H.100/H.110 Switch
FGIO
X
R/W
READBACK, ELSE RETURN
IF DIRECTION = OUTPUT,
RETURN THE DATA REG
THE I/O PIN VALUE.
CONTENTS ON A
OUTPUT
ENABLE
FGx ENABLE
LOGIC
FG
X
5-9428a (F)
77