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SMC91C95
FIGURE 4 - MAPPING AND PAGING VS. RECEIVE AND TX AREA
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PHYSICAL
MEMORY
TX PACKET
NUMBER
RX PACKET
NUMBER
MMU
MMU
2K TX
AREA
2K RX
AREA
11-BIT
LOGICAL
ADDRESS
POINTER
REGISTER
RCV
BIT
RCV VS. TX
AREA
SELECTION
Contents
Main
SMC91C95
PRELIMINARY
ISA/PCMCIA Full Duplex Single-Chip Ethernet and Modem Controller with RAM
FEATURES
TABLE OF CONTENTS
Related Documentation
PIN CONFIGURATION
SMC91C95 128 Pin VTQFP
GENERAL DESCRIPTION
OVERVIEW
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PIN REQUIREMENTS
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Figure 1 - SMC91C95 System Block Diagram for ISA Bus with Boot PROM
10BASET AUI
CABLE SIDE
SMC91C95
DIAGNOSTIC
BUFFER
ADDRESS
SYSTEM BUS
SMC91C95
Figure 2 - SMC91C95 System Block Diagram for Dual Function PCMCIA Card
Figure 3 - SMC91C95 Internal Block Diagram
FUNCTIONAL DESCRIPTION
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FIGURE 4 - MAPPING AND PAGING VS. RECEIVE AND TX AREA
FIGURE 5 - TRANSMIT QUEUES AND MAPPING
B A B C
TX FIFO
C
CPU SIDE
TX COMPLETION FIFO
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FIGURE 7 - SMC91C95 INTERNAL BLOCK DIAGRAM WITH DATA PATH
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FIGURE 9 - INTERRUPT STRUCTURE
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THEORY OF OPERATION
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FIGURE 10 - ETHERNET INTERRUPT SERVICE ROUTINE
FIGURE 11 - INTERRUPT GENERATION FOR TRANSMIT, RECEIVE, MMU
CSMA/CD
MMU
RAM
FIGURE 12 - RX INTR
FIGURE 13 - TX INTR (Assumes Auto Release Option Selected)
FIGURE 14 - TXEMPTY INTR
FIGURE 15 - DRIVER SEND AND ALLOCATE ROUTINES
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PCMCIA CONFIGURATION REGISTERS DESCRIPTION
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FUNCTIONAL DESCRIPTION OF THE BLOCKS
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FIGURE 16 - MMU PACKET NUMBER FLOW AND RELEVANT REGISTERS
CSMA/CD
MMU
RAM
DMA
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FIGURE 17 - 64 X 16 SERIAL EEPROM MAP FOR ISA MODE
OPERATIONAL DESCRIPTION
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TIMING DIAGRAMS
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FIGURE 21 - (I/O WRITE TIMING) (Table on the following page)
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FIGURE 22 - CARD CONFIGURATION REGISTERS - READ/WRITE PCMCIA MODE (A15=1)
FIGURE 23 - PCMCIA CONSECUTIVE READ CYCLES
FIGURE 24 - CONSECUTIVE PCMCIA WRITE CYCLES
FIGURE 25 - PCMCIA ATTRIBUTE MEMORY READ/WRITE (A15=0)
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FIGURE 27 - ISA CONSECUTIVE READ CYCLES
FIGURE 28 - ISA CONSECUTIVE WRITE CYCLES
FIGURE 29 - ISA CONSECUTIVE READ AND WRITE CYCLES
FIGURE 30 - DATA REGISTER SPECIAL READ ACCESS
FIGURE 31 - DATA REGISTER SPECIAL WRITE ACCESS
FIGURE 32 - 8-BIT MODE REGISTER CYCLES
FIGURE 33 - EXTERNAL ROM READ ACCESS
FIGURE 34 - ISA REGISTER ACCESS WHEN USING BALE
FIGURE 35 - EXTERNAL ROM READ ACCESS USING BALE
FIGURE 36 - EEPROM READ
FIGURE 37 - EEPROM WRITE
FIGURE 38 - MEMORY READ TIMING
FIGURE 39 - MEMORY WRITE TIMING
FIGURE 40 - EXTERNAL ENDEC INTERFACE - START OF TRANSMIT
FIGURE 41 - EXTERNAL ENDEC INTERFACE - RECEIVE DATA (RXD SAMPLED BY FALLING RXCLK)
FIGURE 42 - DIFFERENTIAL OUTPUT SIGNAL TIMING (10BASE-T AND AUI)
FIGURE 43 - RECEIVE TIMING - START OF FRAME (AUI AND 10BASE-T)
FIGURE 44 - RECEIVE TIMING - END OF FRAME (AUI AND 10BASE-T)
FIGURE 45 - TRANSMIT TIMING - END OF FRAME (AUI AND 10BASE-T)
FIGURE 46 - COLLISION TIMING (AUI)
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FIGURE 47 - VTQFP PACKAGE OUTLINE
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