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Número de pieza IA21140AF
Descripción PCI FAST ETHERNET LAN CONTROLLER
Fabricantes InnovASIC 
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IA21140AF datasheet

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IA21140AF pdf
IA21140AF
Preliminary Data Sheet
PCI FAST ETHERNET LAN CONTROLLER
I/O Description
The following section provides a functional description of the I/O pins on the IA21140AF.
NAME
Vdd
Vdd_clamp
Vss
ad[31:0]
br_a[1:0]
br_ad[7:0]
br_ce_n
c_be_n[3:0]
devsel_n
frame_n
gep[7:0]
gnt_n
Idsel
int_n
Type
Description
P 3.3 volt input supply voltage.
P 5.0 volt reference for 5.0 volt signaling environments and 3.3 volt reference
for 3.3 volt signaling environments.
P Ground Pin
I/O The PCI address and data lines are multiplexed on the same PCI pins. During
the first clock cycle of a transaction, the 32 bits contain an address and during
subsequent clock cycles, they contain data. Both read and write bursts are
supported in master operation only. Big or Little Indian byte ordering can be
used.
O Address line bit 0 also carries in two consecutive address cycles (bits 16 and
17) in a 256KB configuration. Bit 1 also latches the boot ROM address and
control lines via two external latches.
I/O In the first of two consecutive address cycles, these multiplexed lines contain
the boot ROM address bits [7:2], oe_n, and we_n. The second cycle contains
boot ROM address bits [15:8]. Bits 7 through 0 contain data during the data
cycle. These lines are used to carry data to and from the external register.
O Enable pin for the Boot ROM or an external register. Pin has an internal 5 k O
pull-up resistor.
I/O Bus command and byte enable are multiplexed on the same PCI pins. These
bits provide the bus command during the address phase of the transaction.
They provide the byte enable during the data phase. Byte enable determines
which byte lines carry valid data. Bit 0 coincides with byte 0. Bit 1 coincides
with byte 1, etc.
I/O Indicates that the driving device has decoded its address as the target of the
current access. As an input, determines whether a device on the bus has
been selected.
I/O The IA21140AF bus master asserts this signal to indicate the beginning and
duration of a bus transaction access. Data transfer continues while this signal
is asserted. Deasserting this signal indicates the transaction is in the final
phase.
I/O These pins can be configured by software to perform either input or output
functions for system specific applications.
I Indicates to the IA21140AF that access to the bus has been granted.
I Used as a chip select by the host to indicate configuration read and write
cycles.
O/D When one of the appropriate bits in CSR5 gets set, interrupt request gets
asserted if the corresponding mask bit in CSR7 is not set. If more than one
interrupt bit in CSR5 is set and all input bits are not cleared, interrupt request
gets deasserted for one clock cycle. Interrupt request gets deasserted by
writing a “1” into the appropriate CSR5 bit. This pin must be pulled up by an
external resistor.
Copyright © 2001
innovASIC
The End of Obsolescence
ENG210010110 -00
Page 5 of 19
www.innovasic.com
Customer Support:
1-888-824-4184

5 Page

IA21140AF arduino
IA21140AF
Preliminary Data Sheet
PCI FAST ETHERNET LAN CONTROLLER
AC Characteristics
PCI Clock:
Timing Diagram
5.0 V Clock
2.0 V
0.8 V
3.3 V Clock
0.475 * vdd clamp
0.325 * vdd clamp
Thigh
Tr Tf
Tlow
Tcycle
PCI Clock Specification Timing Characteristics
Symbol Parameter
Min Max
Tcycle
Cycle time
30 50
Thigh
pci_clk high time
11 -
Tlow
pci_clk low time
11 -
Tr pci_clk slew rate
14
Tf pci_clk slew rate
14
Unit
ns
ns
ns
V/ns
V/ns
Copyright © 2001
innovASIC
The End of Obsolescence
ENG210010110 -00
Page 10 of 19
www.innovasic.com
Customer Support:
1-888-824-4184

10 Page





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