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AX88140A Datasheet PDF : 46 Pages
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AX88140A
PRELIMINARY
2.2 PCI interface group
SIGNAL
AD<31>
AD<30>
AD<29>
AD<28>
AD<27>
AD<26>
AD<25>
AD<24>
AD<23>
AD<22>
AD<21>
AD<20>
AD<19>
AD<18>
AD<17>
AD<16>
AD<15>
AD<14>
AD<13>
AD<12>
AD<11>
AD<10>
AD<9>
AD<8>
AD<7>
AD<6>
AD<5>
AD<4>
AD<3>
AD<2>
AD<1>
AD<0>
CBE#<3>
CBE#<2>
CBE#<1>
CBE#<0>
DEVSEL#
FRAME#
GNT#
IDSEL
INT#
IRDY#
TYPE
PIN
PIN
DESCRIPTION
NUMBER NUMBER
FOR 160 PIN FOR 144 PIN
I/O
12,
13,
15,
16,
18,
19,
21,
22,
26,
27,
28,
29,
31,
32,
36,
37,
56,
57,
58,
60,
61,
63,
64,
66,
68,
69,
71,
72,
74,
75,
77,
78
I/O
23,
44,
54,
67
I/O
48
I/O
45
I
9
I
24
O/D
3
I/O
46
10,
Address and data bits are multiplexed on the same pins. During the
11,
address phase, the AD<31:0> contain a physical address (32 bits).
13,
During, data phases, AD<31:0> contain 32 bits of data.
14,
The AX88140A supports both read and write bursts (in master
16,
operation only). Little and big endian byte ordering can be used.
17,
19,
20,
24,
25,
26,
27,
29,
30,
34,
35,
50,
51,
52,
54,
55,
57,
58,
60,
62,
63,
65,
66,
68,
69,
71,
72
21,
BUS COMMAND and BYTE ENABLE Are multiplexed on the
38,
same PCI pins. During the address phase of the transaction,
48,
CBE#<3:0> Provide the BUS COMMAND. During the data phase,
61
CBE#<3:0> Provide the BYTE ENABLE. The BYTE ENABLE
determines which byte lines carry valid data., CBE#<0> Applies to
byte 0, and CBE#<3> Applies to byte 3.
42
Device select Is asserted by the target of the current bus access.
When the AX88140A is the master of the current bus access, the
target assert DEVSEL# confirming the access. It is driven by
AX88140A When AX88140A is selected as a slave.
39
The FRAME# Signal is driven by the AX88140A To indicate the
beginning and duration of an access. FRAME# Asserts to indicate
the beginning of a bus transaction. While FRAME# is asserted,
data transfers continue. When FRAME# deasserts the next data
phase is the final data phase transaction.
7
BUS GRANT Indicates to the AX88140A That access to the bus is
granted.
22
Initialization devise select asserts To indicate that the host is
issuing a configuration cycle to the AX88140A.
1
Interrupt request asserts When one of the appropriate bits of reg5
sets and causes an interrupt, provided that the corresponding mask
bit in reg7 is not asserted. interrupt request deasserts by writing a 1
into the appropriate crs5 bit.
This pin must be pulled up by an external resistor.
40
Initiator ready Indicates the bus master ability to complete the
current data phase of the transaction.
A data phase is completed on any rising edge of the clock When
both IRDY# and target ready TRDY# are asserted. Wait cycles are
inserted until both IRDY# and TRDY# are asserted together.
When the AX88140A is the bus master, IRDY# is asserted during
write operations to indicate that valid data is present on the
AD<31:0>. During read operations, the AX88140A asserts
12
ASIX ELECTRONICS CORPORATION
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