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XRT94L31IB Datasheet(PDF) 3 Page - Exar Corporation |
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XRT94L31IB Datasheet(HTML) 3 Page - Exar Corporation |
3 / 133 page XRT94L31 3 REV. 1.0.1 3-CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER IC PIN DESCRIPTION OF THE XRT94L31 (REV. B) PIN # SIGNAL NAME I/O TYPE DESCRIPTION MICROPROCESSOR INTERFACE Y22 PCLK I TTL Microprocessor Interface Clock Input: This clock input signal is only used if the Microprocessor Interface has been configured to operate in one of the Synchronous Modes (e.g., Power PC 403 Mode). If the Microprocessor Interface is configured to operate in one of these modes, then it will use this clock signal to do the following.· • To sample the CS*, WR*/R/W*, A[14:0], D[7:0], RD*/DS* and DBEN input pins, and· To update the state of D[7:0] and the RDY/DTACK output signals. NOTES: 1. The Microprocessor Interface can work with mPCLK frequencies ranging up to 33MHz. 2. This pin is inactive if the Microprocessor Interface has been configured to operate in either the Intel-Asynchronous or the Motorola-Asynchronousl Modes. In this case, tie this pin to GND. AD25 AD23 AC21 PTYPE_0PTYPE_1P TYPE_2 I TTL Microprocessor Type Select input: These three input pins are used to configure the Microprocessor Inter- face block to readily support a wide variety of Microprocessor Interfaces. The relationship between the settings of these input pins and the corre- sponding Microprocessor Interface configuration is presented below. PTYPE[2:0] Microprocessor Interface Mode 000 Intel-Asynchronous Mode 001 Motorola - Asynchronous Mode 010 Intel X86 011 Intel I960 100 IDT3051/52 (MIPS) 101 Power PC 403 Mode 111 Motorola 860 AD27 AB25 W23 Y24 AD26 AC25 AA24 Y23 AE24 AB20 AD22 AC20 AD21 AE23 AF24 PADDR_0 PADDR_1 PADDR_2 PADDR_3 PADDR_4 PADDR_5 PADDR_6 PADDR_7 PADDR_8 PADDR_9 PADDR_10 PADDR_11 PADDR_12 PADDR_13 PADDR_14 I TTL Address Bus Input pins (Microprocessor Interface): These pins permit the Microprocessor to identify on-chip registers and Buffer/Memory locations (within the XRT94L31) whenever it performs READ and WRITE operations with the XRT94L31. |
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