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82562EZ Datasheet(PDF) 12 Page - Intel Corporation |
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82562EZ Datasheet(HTML) 12 Page - Intel Corporation |
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12 / 66 page  82562EZ(EX)/82547GI(EI) Dual Footprint Design Guide 4 2.2 CSA Port Connection to 82547GI(EI) Gigabit Ethernet Controller The 82547GI(EI) Gigabit Ethernet Controller uses the Communications Streaming Architecture (CSA) port to connect to the Memory Control Hub (MCH). CSA is a point-to-point interface supporting one device. CSA has a theoretical bandwidth of 266 MB/s, sufficient to support Gigabit Ethernet speeds. The connection to the MCH places the Ethernet controller close to system memory for minimum latency. The CSA interface uses IGTL buffers to achieve very high data speeds while controlling transmission line characteristics. For details on connecting the CSA interface between the 82547GI(EI) Gigabit Ethernet Controller and the MCH, please refer to the Intel® 865 Chipset design guide, or the Intel® 875 Chipset design guide. 2.2.1 Generation/Distribution of Reference Voltages The 11-bit CSA port on the 82547GI(EI) controller has a dedicated CI_VREF pin to sample the reference voltage. The nominal CSA port reference voltage is 0.35 V ± 3%. In addition to the reference voltage, a reference swing voltage, CI_SWING must be supplied to control buffer voltage swing characteristics. The nominal CSA port reference voltage swing must be 0.8 V ± 3%. Figure 2. CSA Port Locally Generated Reference Divider Circuits Table 3. CSA Port Reference Circuit Specifications Reference Voltage Specification (V) Reference Swing Voltage Specification (V) 1.2 V Voltage Divider Circuit Recommended Resistor Values ( Ω) 0.350 ± 3% 0.8 ± 3% R1 = 523 ± 1% R2 = 665 ± 1% R3 = 604 ± 1% Intel® 82547GI(EI) 0.35 V 0.8 V CI_SWING CI_VREF R1 R2 R3 C2 C1 C1 C2 1.2V |
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