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ST78C36 Datasheet(PDF) 5 Page - Exar Corporation |
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ST78C36 Datasheet(HTML) 5 Page - Exar Corporation |
5 / 27 page ST78C36/36A 5 REV. 5.1.0 ECP/EPP PARALLEL PRINTER PORT WITH 16-BYTE FIFO 1.0 OVERVIEW This device is designed around the Hewlett Packard/Microsoft specification for Extended Capabilities Port Protocol with “ECR mode 100” defined as Enhanced Parallel Port (EPP) mode. The internal timing engines were designed around a 24 MHz reference, which can be supplied from an external source or by the built-in oscillator circuit (ST78C36ACJ and ST78C36CQ64 only) with an appropriate crystal. At system RESET, the device defaults to standard IBM PC compatible Centronics printer mode (output only). The bi-directional PS/2, EPP, and ECP modes can only be activated by programming the ECR mode field (this requires address bit A10 = 1, which is outside the normal ISA I/O space). Optional capabilities of the ECP specification are set as follows: ■ ECP defined interrupts are pulsed, LOW true (Centronics -ACK is non-pulsed, LOW true). ■ PWord size is forced to 1 byte. ■ There is 1 byte in the transmitter that does not affect the FIFO full bit (ECP modes). ■ RLE compression is not supported in hardware. ■ IRQ channel is selectable as 5, 7, or 9 (ST78C36CQ64 only). ■ DMA channel is selectable as 1, 2, or 3 (ST78C36CQ64 only). ■ FIFO THRESHOLD is set at 8 (used only for non-DMA access to the FIFO). DATA 000 R/W 000, 001 Data Register ECP-AFIFO 000 W 011 ECP FIFO (Address) DSR 001 R All Status Register DCR 002 R/W All Control Register EPP-APort 003 R/W 100 EPP Port (Address) EPP-DPort 004 - 007 R/W 100 EPP Port (Data) C-FIFO 400 W 010 Parallel Port Data FIFO ECP-DFIFO 400 R/W 011 ECP FIFO (Data) T-FIFO 400 R/W 110 Test FIFO Cnfg-A 400 R 111 Configuration Register A Cnfg-B 401 R/W 111 Configuration Register B ECR 402 R/W All Extended Control Register VCC 44 16, 56 Pwr Power Supply (+5V). GND 23,30 15, 25, 37, 48, 64 Pwr Supply Ground. PORT ADDRESS R/W MODE FUNCTION PIN DESCRIPTION NAME 44-PLCC PIN # 64-LQFP PIN # TYPE DESCRIPTION |
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