IXP2400 Intel, IXP2400 Datasheet - Page 21
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IXP2400
Manufacturer Part Number
IXP2400
Description
Manufacturer
Intel
Datasheet
1.IXP2400.pdf
(126 pages)
Specifications of IXP2400
Operating Supply Voltage (typ)
1.3/1.5/2.5/3.3V
Mounting
Surface Mount
Operating Temperature (max)
85C
Operating Temperature (min)
-40C
Operating Temperature Classification
Industrial
Lead Free Status / Rohs Status
Not Compliant
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2.8
2.8.1
2.8.2
2.8.3
Datasheet
XPI Unit
GPIO
The IXP2400 contains eight General-Purpose IO (GPIO) pins. These can be programmed as either
input or output, and can be used for slow-speed IO, such as LEDs or input switches. They can also
be used as interrupts to the Intel XScale core, or to clock the programmable timers.
Serial Port
The IXP2400 contains a standard RS-232–compatible universal asynchronous receiver/transmitter
(UART), which can be used for communication with a debugger or maintenance console. Modem
controls are not supported; if they are needed, GPIO pins can be used for that purpose.
The UART performs serial-to-parallel conversion on data characters received from a peripheral
device and parallel-to-serial conversion on data characters received from the processor. The
processor can read the complete status of the UART at any time during operation. Available status
information includes the type and condition of the transfer operations being performed by the
UART and any error conditions (parity, overrun, framing or break interrupt).
The serial ports can operate in either FIFO or non-FIFO mode. In FIFO mode, a 64-byte transmit
FIFO holds data from the processor to be transmitted on the serial link and a 64-byte receive FIFO
buffers data from the serial link until read by the processor.
The UART includes a programmable baud rate generator that is capable of dividing the internal
clock input (APB_CLK, running at 50 MHz) by divisors of 1 to 2
drive the internal transmitter logic. It also drives the receive logic. The UART can be operated in
polled or in interrupt-driven mode as selected by software.
The UART has two clocks: The clock from the baud rate generator for transmit and receive
operation, and the clock from the XPI unit for register reads and writes.
SlowPort
The SlowPort is an external interface to the IXP2400 and is used for Flash memory access and 8-,
16-, or 32-bit asynchronous device access. It allows the Intel XScale core to do read/ write data
transfers to these slave devices.
The address bus and data bus are multiplexed to reduce the pin count. In addition, the address bus is
also compressed from A[24:0] down to A[7:0] and shifted out with three clock cycles in Mode 0,
and four clock cycles in Mode 1–4. Therefore, an external set of buffers is needed to latch the
address. Two chip selects are provided. Several modes of configurations are supported to connect
with the microprocessor control port of various framers or MAC devices. See
example configuration (note that the ACK signal is optional).
Intel
®
16
IXP2400 Network Processor
- 1, and produces a 16x clock to
Figure 8
for an
21
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