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PSD4235G2 Datasheet(PDF) 45 Page - STMicroelectronics |
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PSD4235G2 Datasheet(HTML) 45 Page - STMicroelectronics |
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45 / 89 page  45/89 PSD4235G2 Figure 23. Interfacing the PSD with an 80C51XA-G3 80C51XA. The Philips 80C51XA MCU has a 16- bit multiplexed bus with burst cycles. Address bits (A3-A1) are not multiplexed, while (A19-A4) are multiplexed with data bits (D15-D0). The PSD4235G2 supports the 80C51XA burst mode. The WRH signal is connected to PD3, and WHL is connected to CNTL0. The RD and PSEN signals are connected to the CNTL1 and CNTL2 pins. Figure 23 shows the schematic diagram. The 80C51XA improves bus throughput and per- formance by issuing burst cycles to fetch codes from memory. In burst cycles, address A19-A4 are latched internally by the PSD, while the 80C51XA drives the A3-A1 signals to fetch sequentially up to 16 bytes of code. The PSD access time is then measured from address A3-A1 valid to data in val- id. The PSD bus timing requirement in a burst cy- cle is identical to the normal bus cycle, except the address setup and hold time with respect to Ad- dress Strobe (ALE/AS, PD0) is not required. VCC_BAR VCC_BAR D[15:0] WRL\ RD\ PSEN\ ALE A4D0 A5D1 A6D2 A7D3 A8D4 A9D5 A10D6 A11D7 A12D8 A13D9 A14D10 A15D11 A16D12 A17D13 A18D14 A19D15 RESET\ RESET\ A3 A2 A1 WRH\ A[3:1] A1 A2 A3 U3 CRYSTAL PSD ADIO0 3 ADIO1 4 ADIO2 5 ADIO3 6 ADIO4 7 ADIO5 10 ADIO6 11 ADIO7 12 ADIO9 14 ADIO10 15 ADIO11 16 ADIO12 17 ADIO13 18 ADIO14 19 ADIO15 20 PF0 31 PF1 32 PF2 33 PF3 34 PF4 35 PF5 36 PF6 37 PF7 38 PG1 22 PG2 23 PG3 24 PG4 25 PG5 26 PG6 27 PG7 28 PA5 56 PA6 57 PA7 58 CNTL0(WR) 59 CNTL1(RD) 60 CNTL2(PSEN) 40 PD0 (ALE) 79 RESET 39 ADIO8 13 PG0 21 PA3 54 PA4 55 PA2 53 PA0 51 PA1 52 PB0 61 PB1 62 PB2 63 PB3 64 PB4 65 PB5 66 PB6 67 PB7 68 PC0 41 PC1 42 PC2 43 PC3 44 PC4 45 PC5 46 PC6 47 PC7 48 PE0 (TMS) 71 PE1 (TCK/ST) 72 PE2 (TDI) 73 PE3 (TDO) 74 PE4 (TSTAT/RDY) 75 PE5 (TERR) 76 PE7 (VBATON) 78 PD2 (CSI) 1 PD1 (CLKIN) 80 PD3 (WRH) 2 PE6 (VSTBY) 77 XA-G3 A0/WRH 2 A1 3 A2 4 A3 5 A4D0 43 A5D1 42 A6D2 41 A7D3 40 A8D4 39 A9D5 38 A10D6 37 A11D7 36 A12D8 24 A13D9 25 A14D10 26 A15D11 27 A16D12 28 A17D13 29 A18D14 30 A19D15 31 PSEN 32 RD 19 WRL 18 ALE 33 RST 10 INT0 14 INT1 15 EA/WAIT 35 BUSW 17 XTAL1 21 XTAL2 20 RXD0 11 TXD0 13 RXD1 6 TXD1 7 T2EX 9 T2 8 T0 16 D[15:0] A[3:1] AI04952b |
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