Cirrus Logic Crystal LAN CS8900A Application Note
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Cirrus Logic Crystal LAN CS8900A Application Note

Ethernet controller technical reference manual
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Application Note
&U\VWDO /$1ΠCS8900A ETHERNET CONTROLLER
TECHNICAL REFERENCE MANUAL
By Deva Bodas
Revised by James Ayres

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Summary of Contents for Cirrus Logic Crystal LAN CS8900A

  • Page 1 Application Note &U\VWDO /$1Œ CS8900A ETHERNET CONTROLLER TECHNICAL REFERENCE MANUAL By Deva Bodas Revised by James Ayres...

  • Page 2: Schematic Checklist

    The schematic checklist and the example connec- EEDataIn should be pulled to ground if not used. tion diagrams to the Hitachi SH3, Cirrus Logic CL- 10Base-T circuit -- no caps on TX lines between PS7211 and the Motorola MC68302 microproces- isolation transformer and 10 Base-T connector.
  • Page 3 INTRODUCTION TO CS8900A As shown in the Figure 1, the CS8900A requires a TECHNICAL REFERENCE MANUAL minimum number of external components. The EEPROM stores configuration information such as This Technical Reference Manual provides the in- interrupt number, DMA channel, I-O base address, formation which will be helpful in designing a memory base address, and IEEE Individual Ad- board using the CS8900A, programming the asso-...
  • Page 4 DMARQ0 nCS2 nCS2 SBHE DMARQ1 DMARQ2 CS8900_RST RESET SLEEP DMACK0 TESTSEL DMACK2 ELCS DMACK3 XTLI CSOUT XTLO CS8900A 20MHz U30A nURESET CS8900_RST nURESET 74LVX04 100nF 100nF 100nF 100nF 100nF 100nF 100nF Figure 4. CS8900A Interface to Cirrus Logic CL-PS7211 AN83REV3...
  • Page 5 3.3V 3.3V SH3 A1 SH3 A2 SH3 A3 RDX- RXD+ SA10 SA11 SA12 TXD- SA13 SA14 RXD- SA15 RXD+ 560pF SA16 TXD- TXD+ SA17 TXD+ SA18 3.3V SA19 BSTATUS/HC1 LINKLED/HC0 LANLED CSOUT XTAL1 20MHz XTAL2 SD10 SD11 SD12 SD13 SD14 SD15 CS8900A-CQ3 SH3 [D15:D0]...

  • Page 6: 10Base-T Interface

    PROM is not necessary for the CS8900A, and the tion transformer at location T1. This isolation CS8900A will respond to IO addresses 0300h transformer has a 1:1 ratio between the primary and through 030Fh after a reset. the secondary windings on the receive side. It has a 1:√2 (1:1.414) ratio between the primary and the Please refer to the CS8900A data sheet for informa- secondary windings for the transmit lines for 5V...
  • Page 7 0.1 µ F EE_CLK 1K_EEPROM_S 4.99k, 1% XTAL XTL1 20.0 MHz XTL2 EECS ISA0 EEDATAOUT SA00 ISA1 SA01 ISA2 SA02 LED0/HC0 ISA3 SA03 ISA4 BSTATUS / HC1 SA04 LED2 ISA5 SA05 ISA6 SA06 ISA7 SA07 ISA8 SA08 ISA9 SA09 ISA10 SA10 ISA11 SA11...

  • Page 8: Component Placement And Signal Routing

    10BT_RD- (1-3) (16-14) 1:1 10BT_RD+ 10BT_TD- (6-8) (11-9) 1:1.414 68 pF 24.3 10BT_TD+ 24.3 10 BaseT Transformer Do Not Do Not Populate .1 µF Populate .1 µF .1 µF 2KV .1 µF 2KV Figure 10. 10BASE-T Schematic 5V Component Placement and Signal Routing Please refer to “Layout Considerations for the CS8900A”...
  • Page 9 0.1µF EE_CLK ELCS 1K_EEPROM_S 4.99k BSTATUS / HC1 XTAL 20.0 MHz XTL1 XTL2 LED_T EECS ISA0 SA00 EEDATAOUT ISA1 SA01 ISA2 SA02 LED0/HC0 99 LED_B ISA3 SA03 BSTATUS / HC1 ISA4 SA04 LED2 ISA5 SA05 ISA6 SA06 ISA7 SA07 ISA8 SA08 ISA9 SA09...
  • Page 10 TANT TANT TANT 22 µ F 22 µ F 22 µ F Figure 14. Power Supply Decoupling Schematic PROM_CS 0.1 µ F 0.1 µ F 4.7k SA00 SA01 SA02 SA03 SA04 SA05 SA06 SA07 SA08 SA09 SA10 SA11 SA12 SA13 SA14 27C256 74LS245...
  • Page 11 +12V VP_+12V 0.1 µ F CON_AUI15PSUBO 39.2 39.2 CI_B CI_A DO_A DO_B DI_B DI_A 39.2 Ω R9 39.2 AUI_XFR_S YL18-1005D 0.1 µ F 0.1 µ F Figure 16. AUI Schematic +12IN1 ISOLATED_GND SOUT+ +12V +12IN2 SOUT- 0.1 µ F 0.1 µ F BSTATUS/HCI -9_V 0.1 µ...

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