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FM3565M20X Datasheet(PDF) 3 Page - Fairchild Semiconductor |
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FM3565M20X Datasheet(HTML) 3 Page - Fairchild Semiconductor |
3 / 7 page 3 www.fairchildsemi.com www.fairchildsemi.com FM3565 Rev. A.1 Functional Description The FM3565 block diagram is shown in Figure 1. Operational Modes During standard operation, the device will pass data to the Y-Port either from the I-Port or from one of the internally stored Non- Volatile Register values. The I-port values are generated from the motherboard of the system and may be hardwired or driven by another device. Pull- up resistors are provided on the device to accommodate this device being driven by open-drain output drivers. The device expects standard CMOS input signals. The outputs (Y0-Y4) operate in the open-drain mode. The OVRD (override) input, when set to 0, will cause all the outputs to be set to 0. The WP signal, if set to logic 1, will prevent data from being written to the non-volatile register. The functioning of this device is described by the truth table in Table 1. Output Port: Y0-Y4 The output port is an open-drain output to allow for easy connec- tion to devices running at different voltage levels. The port is always active and either passes the value on the I-Port or data from one of the internal non-volatile registers (SOPRA/B). Chang- ing the Mux Path is accomplished using the external hardware controls – OVRD, MUXSEL, and A/B. Register Description The FM3550/60 has 3 registers in total. These registers are made up of a combination of read-only, write-only and read/write bits. The two registers are listed below. Serial Output Port Register A(SOPRA) Address: 00H - A read/ write register that contains the new value of SOPRA. Serial Output Port Register B(SOPRB) Address: 01H - A read/ write register that contains the new value for SOPRB. Parallel Input Port Register (PIPR) Address: 02H - A read-only register that is loaded with the 5-bit value of the I-Port. Serial Output Port Register (SOPR) (Address 000b and 001b) MXSB MXSA Data Field 0 0 I5 0 I3I2I1 I0 b7 b6 b5 b4 b3 b2 B1 b0 b7-b6 - Multiplexer Select Bits (MXSB,MXSA) 00 - Multiplexer passes the SOPR(A). 01 - Multiplexer passer the SOPR(B). 10 - Multiplexer defaults to passing the I-Port Value. b5, b3-b0 - Data Field. New value to be output through the multiplexer. Parallel Input Port Register (PIPR) (Address 002b) Address Field Data Field 0 0 0 I4 I3I2I1 I0 b7 b6 b5 b4 b3 b2 B1 b0 b7-b5 - Address field. Value is always 000 b4-b0 - Data Field. Value is equal to the value on the I-Port. The external Port Register captures the value on the I-Port. Data is latched into this register on the first clock after a start condition is seen. This insures that a valid value will always be in this register if it is read. This register is a-read only register with respect to the IIC port. |
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