79RC32K438-233BBI IDT, 79RC32K438-233BBI Datasheet - Page 12

• Manufacturer Part Number: 79RC32K438-233BBI
• Description: Processors - Application Specialized
• Manufacturer: IDT

Specifications of 79RC32K438-233BBI

• Part # Aliases: IDT79RC32K438-233BBI

Pin Characteristics
IDT 79RC32438
Note: Some input pads of the RC32438 do not contain internal pull-ups or pull-downs. Unused inputs should be tied off to appropriate
levels. This is especially critical for unused control signal inputs (such as BRN) which, if left floating, could adversely affect the RC32438’s
operation. Also, any input pin left floating can cause a slight increase in power consumption.
Memory and
Peripheral Bus
Function
JTAG_TRST_N
Debug
CPU
INST
Signal
BDIRN
BGN
BOEN
BRN
BWEN[1:0]
CSN[5:0]
MADDR[21:0]
MDATA[15:0]
OEN
RWN
WAITACKN
Pin Name
Type
O
O
I
JTAG Reset. This active low signal asynchronously resets the boundary scan
logic, JTAG TAP Controller, and the EJTAG Debug TAP Controller. An external
pull-up on the board is recommended to meet the JTAG specification in cases
where the tester can access this signal. However, for systems running in func-
tional mode, one of the following should occur:
1) actively drive this signal low with control logic
2) statically drive this signal low with an external pull-down on the board
3) clock JTAG_TCK while holding EJTAG_TMS and/or JTAG_TMS high.
CPU Transaction. This signal is asserted during all CPU instruction fetches and
data transfers to/from the DDR and devices on the memory and peripheral bus.
The signal is negated during PCI and DMA transactions to/from the DDR and
devices on the memory and peripheral bus.
Instruction or Data. This signal is driven high during CPU instruction fetches on
the memory and peripheral bus memory or DDR bus.
Table 2 Pin Characteristics (Part 1 of 4)
Table 1 Pin Description (Part 9 of 9)
Type
I/O
O
O
O
O
O
O
O
O
I
I
12 of 59
Buffer
LVTTL
LVTTL
LVTTL
LVTTL
LVTTL
LVTTL
LVTTL
LVTTL
LVTTL
LVTTL
LVTTL
Name/Description
I/O Type
High Drive
High Drive
High Drive
High Drive
High Drive
High Drive
High Drive
High Drive
Low Drive
STI
STI
2
Resistor
Internal
pull-up
pull-up
Notes
1
May 25, 2004