SPC8106 S-MOS Systems, SPC8106 Datasheet - Page 20

• Manufacturer Part Number: SPC8106
• Description: LCD/CRT VGA CONTROLLER
• Manufacturer: S-MOS Systems

Video Memory Interface
Clock Inputs
Data Sheet
Pin Name
IOCS16#
BHE#
Pin Name
MA[0:9]
MD[0:15]
RAS#
LCAS#
(LWE#)
UCAS#
(CAS#)
WE#
(UWE#)
Pin Name
CLKI1
CLKO1
CLKI2
CLKO2
DS-14
S-MOS Systems, Inc. • Tel: [phone] • Fax: [phone] • http://www.smos.com
Type Pin #
O
I
Type
O
I/O
O
O
O
O
Type
I
O
I
O
100
101
Pin #
57, 55,
53, 51,
48, 52,
54, 56,
58, 20
81, 79,
77, 75,
70, 68,
66, 64,
63, 65,
67, 69,
74, 76,
78, 80
59
62
60
61
Pin #
90
91
86
87
Description
ISA Bus I/O Chip Select 16. Address inputs A[15:0] and IOEN# are decoded to
drive this output low when a valid SPC8106 I/O register address appears on the
bus,. Note that I/O addresses 3C6h-3C9h do not result in IOCS16# being driven low
(i.e. RAMDAC and internal LUT register reads and writes are 8 bit cycles).
ISA Bus Byte High Enable. In Suspend Mode the BHE# input is disabled.
Description
Multiplexed row/column address bits for video display memory.
Data bits for video display memory. The output drivers of these pins are placed into
a high-impedance state when RESET is high, or when the Sequencer is in a reset
state. On the falling edge of RESET, the values on MD[3:0] and MD[12:9] are
latched into a read-only Auxiliary Register and are available to be read as
configuration inputs. Also, the value on MD[8:4] and MD[15:13] are used to
configure various hardware options. See “Summary of Configuration Options” on
page 18 for details.
DRAM Row Address Strobe for single 256Kx16 DRAM.
Multiple Function:
DRAM Column Address Strobe for low byte (LCAS#). For alternate function see
“Multiple Function Pin Descriptions” on page 19.
Multiple Function:
DRAM Column Address Strobe for high byte (UCAS#). For alternate function see
“Multiple Function Pin Descriptions” on page 19.
Multiple Function:
DRAM Write Enable Strobe (WE#). For alternate function see “Multiple Function
Pin Descriptions” on page 19.
Description
This pin, along with CLKO1 is the 25.175 MHz 2-terminal crystal interface when
using a 2-terminal crystal as the clock input. If an external oscillator is used as a
clock source, then this pin is the clock input.
This pin, along with CLKI1 is the 25.175 MHz2-terminal crystal interface when
using a 2-terminal crystal as the clock input. If an external oscillator is used as a
clock source, then this pin should be left unconnected.
This pin, along with CLKO2 is the 28.322 MHz 2-terminal crystal interface when
using a 2-terminal crystal as the clock input. If an external oscillator is used as a
clock source, then this pin is the clock input.
This pin, along with CLKI2 is the 28.322 MHz 2-terminal crystal interface when
using a 2-terminal crystal as the clock input. If an external oscillator is used as a
clock source, then this pin should be left unconnected.
411-1.0
SPC8106