Acer TM7300 Series Service Manual page 92

Table 2-3 NM2160 Pin Descriptions
Number Pin name
96 B
101 REXT
TV interface
79 CSYNC
74 NTSC_PAL
147 FSC
98 R
97 G
96 B
Power Management
76 Standby/
Status1
77 Suspend
77 Suspend
75 Activity
82 RTC32K/
Status2
ZV Interface
Major Chips Description
I/O
O
BLUE This DAC analog output drives the CRT interface
(Analog)
I
DAC Current reference This pin is used as a current reference by
(Analog)
the internal DAC. Please refer to the NM2160 system schematics
for the external circuit
O
Composite Sync This output is the composite synchronization
T/S
signal for RGB-to-NTSC or PAL/SECAM External Analog Encoders
O
NTSC/PAL/SECAM Encoding Selection This pin is used to select
T/S
the mode NTSC or PAL/SECAM in which the external analog
encoder need to be driven
O Sub-Carrier Frequency Selection This pin provides an
appropriate Sub-carrier frequency 1xfsc or 4xfsc to an external
NTSC or PAL/SECAM analog encoder
O
RED This DAC analog video red component output is to drive the
(Analog)
external RGB-to-NTSC or PAL/SECAM analog encoders
O
GREEN This DAC analog video green component output is to
(Analog)
drive the external RGB-to-NTSC or PAL/SECAM analog encoders
O
BLUE This DAC analog video blue component is to drive the
(Analog)
external RGB-to-NTSC or PAL/SECAM analog encoders external
I/O
Standby/Status1 The direction of the pin is controlled by GR18 bit
3. In output mode, this pin indicates the state of standby mode.
The state of this pin is reflected in register CR25 bit 5 and can be
used as a status pin
I/O
Suspend This pin can be configured as control Suspend input or
status Suspend output. The active high input mode is used for
controlling hardware Suspend. When asserted NM2160 is forced
into suspend mode where all the inputs are disabled and chip goes
into the low power mode NM2160 will come out of suspend only by
de-asserting this pin
I/O During output mode, this pin will indicate the software suspend
status
I/O
Activity This pin when in input mode and asserted indicates the
system activity. A high on this pin can be used to reset internal
timers. This pin when in output mode is a General Purpose Output
pin as defined by CR2F bits 5&4, which can be used to control the
IMI chip for reduced EMI
I/O
Real Time Clock 32Khz/Status2 This pin is used to feed 32 kHz
from an external source. It is used to generate the refresh timing
for the internal display memory during Standby and software
Suspend modes. 14 MHz can be used to generate the memory
refresh timing in above modes. / General purpose Status bit 3, can
be read from register CR27 bit 0
Description
2-35