MCD212 Motorola, MCD212 Datasheet - Page 17

• Manufacturer Part Number: MCD212
• Description: Video Decoder and System Controller(with JTAG)
• Manufacturer: Motorola

2–2
2.2.2
2.2.3
Dynamic RAM Interface
Video Interface
CSROM
CSIO
INT
Mnemonic
MA0 –
MA9
MD0 –
MD15
RAS
CAS1
CAS2
UWR
LWR
Mnemonic
R0 – R7
G0 – G7
B0 – B7
OE
VSYNC
HSYNC
CSYNC
Type
Type
I/O
I/O
I/O
I/O
O
O
O
O
O
O
O
O
O
O
O
O
I
Chip Select ROM output. Active low. Asserted by an access on the
system bus in the ROM address area, and when UDS and/or LDS
are asserted.
Chip Select I/O output. Active low. Asserted by an access on the
system bus in the I/O area, and when UDS and/or LDS are
asserted.
Interrupt request output. Active low, three–state. Used to generate
interrupts to the CPU. This pin must be pulled up externally.
Name and Function
Memory Address lines. Multiplexed row/column address line outputs
for DRAM control.
Bidirectional Memory Data bus, three–state. Used to transfer data
between DRAM bus and VDSC. Stable when LWR and/or UWR is
asserted during a write cycle. Driven by VDSC during read cycles.
MD0 is the least significant bit.
Row Address Strobe. Active low. Validates the DRAM row address
on the falling edge.
Column Address Strobe for memory bank 1. Active low, three–state.
Validates the DRAM column address on the falling edge. Input
during reset sequence to select/deselect memory bank 1. Active
high validates bank inputs.
Column Address Strobe for memory bank 2. Active low, three–state.
Validates the DRAM column address on the falling edge. Input
during reset sequence to select/deselect memory bank 2. Active
high validates bank inputs.
Write signal for DRAM. Active low. It is asserted when writing
MD8 – MD15 to the DRAM.
Write signal for DRAM. Active low. It is asserted when writing
MD0 – MD7 to the DRAM.
Name and Function
Red color output (R7 = MSB, R0 = LSB). Three–state.
Green color output (G7 = MSB, G0 = LSB). Three–state.
Blue color output (B7 = MSB, B0 = LSB). Three–state.
Output Enable. Active high. It disables three–state of RGB output.
Vertical Synchronization. Active low. In master mode, this output is
used as vertical synchronization signal for monitor. In slave TV
mode it becomes a vertical synchronization input.
Horizontal Synchronization. Active low. This output is used as a
horizontal synchronization signal.
Composite synchronization. Active low. This output is used as a
composite synchronization signal.
MCD212
MOTOROLA