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KSZ8842-16MQL-EVAl Datasheet(PDF) 14 Page - Micrel Semiconductor |
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KSZ8842-16MQL-EVAl Datasheet(HTML) 14 Page - Micrel Semiconductor |
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14 / 141 page  Micrel, Inc. KSZ8842-16/32 MQL/MVL/MVLI/MBL October 2007 14 M9999-102207-1.9 Pin Number Pin Name Type Pin Function 12 BCLK Ipd Bus Interface Clock Local bus clock for synchronous bus systems. Maximum frequency is 50MHz. This pin should be tied Low or unconnected if it is in asynchronous mode. 13 NC Ipu No connect. 14 NC Opu No connect. 15 SRDYN Opu Synchronous Ready Not Ready signal to interface with synchronous bus for both EISA-like and VLBus- like extend accesses. For VLBus-like mode, the falling edge of this signal indicates ready. This signal is synchronous to the bus clock signal BCLK. For burst mode (32-bit interface only), the KSZ8842M drives this pin low to signal wait states. 16 INTRN Opd Interrupt Active Low signal to host CPU to indicate an interrupt status bit is set, this pin need an external 4.7K pull-up resistor. 17 LDEVN Opd Local Device Not Active Low output signal, asserted when AEN is Low and A15-A4 decode to the KSZ8842M address programmed into the high byte of the base address register. LDEVN is a combinational decode of the Address and AEN signal. 18 RDN Ipd Read Strobe Not Asynchronous read strobe, active Low. 19 EECS Opu EEPROM Chip Select 20 ARDY Opd Asynchronous Ready ARDY may be used when interfacing asynchronous buses to extend bus access cycles. It is asynchronous to the host CPU or bus clock. This pin need an external 4.7K pull-up resistor. 21 CYCLEN Ipd Cycle Not For VLBus-like mode cycle signal; this pin follows the addressing cycle to signal the command cycle. For burst mode (32-bit interface only), this pin stays High for read cycles and Low for write cycles. 22 P2LED3 Opd Port 2 LED indicator See the description in pins 6, 7, and 8. 23 DGND Gnd Digital IO ground 24 VDDCO P 1.2V digital core voltage output (internal 1.2V LDO power supply output), this 1.2V output pin provides power to VDDC, VDDA and VDDAP pins. Note: Internally generated power voltage. Do not connect an external power supply to this pin. This pin is used for connecting external filter (Ferrite bead and capacitors). It is recommended this pin should be connected to 3.3V power rail by a 100 ohm resistor for the internal LDO application. 25 VLBUSN Ipd VLBus-like Mode Pull-down or float: Bus interface is configured for synchronous mode. Pull-up: Bus interface is configured for 8-bit or 16-bit asynchronous mode or EISA-like burst mode. 26 EEEN Ipd EEPROM Enable EEPROM is enabled and connected when this pin is pull-up. EEPROM is disabled when this pin is pull-down or no connect. |
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