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STSAM9708 Datasheet(PDF) 3 Page - ATMEL Corporation |
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STSAM9708 Datasheet(HTML) 3 Page - ATMEL Corporation |
3 / 30 page 3 ATSAM9708 1772D–DRMSD–01/04 Pin Description by Function Notes: 1. ISA bus group pins are powered by V CC1 power rail. 2. PC_D pads have 4 mA drive capabilities; other output pads have 16 mA drive capabilities. 3. To interface with PC ISA bus, V CC1 should be connected to 5V power and PC_D bus should be buffered. Direction is given by PC_RD signal. 4. Pin Names in this document exhibiting an overbar (PC_CS for example) indicates that the signal is active low. Table 1. Power Group Name Pin Count Type Function GND 19 PWR Power Ground. All GND pins should be returned to digital ground. VC3 8 PWR Core Power, +3.3V nominal (3V to 4.5V). All V C3 pins should be returned to +3.3V. VCC1 5 PWR Pad (except Memory Pad) Power, +3.0V to +5.5V. All V CC pins should be returned to +5V (or 3.3V in case of single 3.3V supply). VCC2 5 PWR Memory Pad Power, +3.0V to +5.5V. All V CC pins should be returned to +5V (for RAM or DRAM) or 3.3V (for SDRAM or 3.3V ROM). Table 2. ISA Bus Group (1) Name Pin Count Type Function PC_D[15:0](2, 3) 16 I/O 16-bit data bus to host processor. Information on these pins is: - 2 x parallel MIDI (MPU-401 type applications) - 2 x high-speed burst data transfers to/from external memory PC_A[2:0] 3 IN Selects one of 8 internal registers: 0, 1: MPU-401 register processor #1 2, 3: Burst data (16-bit) processor #1 4 - 5: MPU-401 register processor #2 6 - 7: Burst data (16-bit) processor #2 PC_CS(4) 1 IN Chip select from host, active low. PC_WR 1 IN Write from host, active low. PC_RD 1 IN Read from host, active low. PC_READY 1 TSout Open drain output buffer. Driven low during 16-bit burst mode transfers to synchronize host to the ATSAM9708 memory. PC_IO16 1 TSout Open drain output buffer; driven low during 16-bit burst mode transfers. Indicates to host that a 16-bit I/O is in progress. PC_IRQ 1 TSout Tri-state output pin, active high. Can be connected directly to host PC_IRQ line. |
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