TNETX15AEPGE Datasheet, PDF (9/79 Pages) Texas Instruments – ADDRESS-LOOKUP DEVICE

TNETX15AE
ADDRESS-LOOKUP DEVICE
SPWS041A – AUGUST 1997 – REVISED OCTOBER 1997
Terminal Functions (Continued)
DIO interface-statistics
TERMINAL
I/O
NAME NO.
EINT
112
0
ESCS
86
I
SAD1
85
SAD0
84
I
SDATA7† 81
SDATA6 80
SDATA5 79
SDATA4
SDATA3
78
76
I/O
SDATA2 75
SDATA1 74
SDATA0‡ 73
SRDY
88
O
SRNW
83
I
† _{Most-significant bit}
‡ _{Least-significant bit}
DESCRIPTION
TNETX15AE interrupt. EINT is an interrupt request from the TNETX15AE to an optional attached
microprocessor. Its purpose is to reduce the polling that is required for the processor to be current on the
operational states of the TNETX15AE. The interrupt cause is determined by reading the interrupt register
(0x28, 0x29). It is not required to acknowledge or act on the interrupts (unmanaged operation). EINT is
active high and level sensitive; it is high when any of the interrupt triggers are active.
TNETX15AE chip select. When ESCS is active (low), a port access is valid for the TNETX15AE device.
ESCS must not be tied to any other chip-select signal (such as the TNETX3150/TNETX3150A SCS or the
TNETX3100 SCS).
DIO address bus. SAD1–SAD0 selects the TNETX15AE host registers.
SAD1 SAD0
Description
00
DIO address low
01
DIO address high
10
DIO data
1 1 DIO data auto increment
DIO data bus. SDATA7–SDATA0 is a byte-wide bidirectional DIO bus.
DIO ready. When SRDY is active low, the following conditions occur:
– When SRNW = 1, the interface host is told that data is valid for reading by the host.
– When SRNW = 0, the interface host is told that data has been received by the TNETX15AE.
When ESCS is inactive high, SRDY is disabled [high-impedance (Z) state].
DIO read/not write. SRNW is a read- or write-select signal.
– When SRNW is high, the read operation is performed by the host.
– When SRNW is low, the write operation is performed by the host.
DIO interface-MII
TERMINAL
I/O
NAME NO.
MDCLK
113
O
MDIO
109 I/O
MRESET 114
O
DESCRIPTION
MII management data clock. MDCLK is a clock from the TNETX15AE for the serial MII management data MDIO.
MDCLK can be disabled [high-impedance (Z) state] by MDIOEN [a bit in the SIO register at 0x0A (DIO)].
MII management data input/output. MDIO is the data terminal for serial MII management data. MDIO requires
an external pullup resistor for proper operation. MDIO can be disabled [high-impedance (Z) state] by MDIOEN
[a bit in the SIO register at 0x0A (DIO)].
MII management reset. MRESET is a reset signal for the serial MII management interface. MRESET can be
disabled [high-impedance (Z) state] by MDIOEN [a bit in the SIO register at 0x0A (DIO)].
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