AX88850 ASIX [ASIX Electronics Corporation], AX88850 Datasheet - Page 16

• Manufacturer Part Number: AX88850
• Description: 100BASE-TX/FX Repeater Controller
• Manufacturer: ASIX [ASIX Electronics Corporation]

2.5 Expansion Bus Interface
IRD[3:0]
/IRD_ER
/IRD_V
IRD_CK
IRD_ODIR
/IR_ACTO
[7:0]
/IR_ACTI[7:0]
or
RID[4:0]
/IR_ACTI[4:0]
/DIS_DAISY
/IR_ACTI[5]
/TO_ID_CLR
/IR_ACTI[6]
/IR_ACT_EN
/IR_ACTI[7]
Signal Name Type Pin No.
AX88850
I/O/OC
I/O/Z
I/O/Z
I/O/Z
I/O/Z
/MH
/MH
/MH
/MH
I/PU
I/PU
I/PU
I/PU
I/PU
O/L
/PU
/PU
/PU
/H
164-161 INTER REPEATER DATA : Nibble data input/output. Transfer data from
152-145 INTER REPEATER ACTIVITY IN/OUT: Then the local repeater activity
143-136
140-136
159
158
157
154
141
142
143
the “active” AX88850 to all other “inactive” AX88850s. The bus-master of
the IRD bus is determined by IR_VECT bus arbitration.
INTER REPEATER DATA ERROR: This signal reflect the RX_ER status
of the active port across the inter repeater bus. Used to track receive errors
from the PHY in real time.
INTER REPEATER DATA VALID : This signal reflect the RX_DV status
of the active port across the inter repeater bus. Used to frame good packets.
INTER REPEATER CLOCK VALID : All inter repeater signals
synchronized to the rising edge of this clock.
INTER REPEATER DATA IN/OUT DIRECTION : This pin indicates the
direction of data for external transceiver.
appearance, the signal of the related RID (Repeater ID) will be asserted and as
a output pin. All other pins serve as input pins but except the collision
conditions. When collision occurred all of the signal of related (RID-1) pins
will served as outputs and will active during local collision period. The
exception case is when RID = 0, then (RID-1) is replaced with (RID+1)=1.
INTER REPEATER ACTIVITY IN: These pins perform the same function
as /IR_ACTO[7:0] when they serve as input function. Then the
/IR_ACTO[7:0] insert external buffers the input function must be replaced
with /IR_ACTI [7:0].
The /IR_ACTI[7:0] also serve as power-on configuration input:
Repeater Identification Number Parallel In RID[4:0]: When power on reset
these pin as inputs to setup the repeater ID of the chip. RID[2:0] indicate the
repeater ID from 0 to 7. RID[4:3] defines the group code in the cascade
system and must keep difference with PHY ID address definition.
Disable RID Daisy-chain Input. No matter what kind of data input from
DAISY_IN pin ,the repeater ID will never be changed from DAIST_IN.
Time Out to Clear repeater ID : Within the time out period, if no daisy chain
repeater ID input. The repeater ID will be clear to RID=0 . Otherwise, the
repeater ID will remain the previous value ( power on configured value ,
previous daisy chain reconfigured value or the configuration value written via
station management port).The tome out period is about 4 to 5 second.
/IR_ACTI[7:0] pins function is enable when IR_ACT_EN is pulled “low”
when power on. Otherwise , it is disable.
“High” = IRD[3:0], /IRD_ER, /IRD_V , IRD_CK are Output.
“Low” = IRD[3:0], /IRD_ER, /IRD_V , IRD_CK are Input.
16
Description
ASIX ELECTRONICS CORPORATION
PRELIMINARY
are