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M36W216T Datasheet(PDF) 9 Page - STMicroelectronics |
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M36W216T Datasheet(HTML) 9 Page - STMicroelectronics |
9 / 62 page 9/62 M36W216TI, M36W216BI VSSF and VSSS Ground. VSSF and VSSS are the ground reference for all voltage measurements in the Flash and SRAM chips, respectively. Note: Each device in a system should have VD- DF, VDDQF and VPPF decoupled with a 0.1µF ca- pacitor close to the pin. See Figure 9, AC Measurement Load Circuit. The PCB trace widths should be sufficient to carry the re- quired VPPF program and erase currents. FUNCTIONAL DESCRIPTION The Flash and SRAM components have separate power supplies and grounds and are distinguished by three chip enable inputs: EF for the Flash mem- ory and E1S and E2S for the SRAM. Recommended operating conditions do not allow both the Flash and the SRAM to be in active mode at the same time. The most common example is simultaneous read operations on the Flash and the SRAM which would result in a data bus con- tention. Therefore it is recommended to put the SRAM in the high impedance state when reading the Flash and vice versa (see Table 2 Main Oper- ation Modes for details). Figure 4. Functional Block Diagram AI07904 Flash Memory 16 Mbit (x16) VSSF EF GF WF RPF WPF E1S GS WS UBS LBS DQ0-DQ15 VDDF VPPF A17-A19 A0-A16 SRAM 2 Mbit (x16) VSSS VDDS VDDQF E2S |
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