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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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DSP56857 датащи(PDF) 135 Page - Freescale Semiconductor, Inc |
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DSP56857 датащи(HTML) 135 Page - Freescale Semiconductor, Inc |
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135 / 662 page  Register Descriptions (EMI_BASE = $1FFE40) External Memory Interface (EMI), Rev. 4 Freescale Semiconductor 5-9 Figure 5-4. Chip Select Option Registers 0–3 (CSOR0–CSOR3) See Programmer’s Sheets on Appendix page C- 10 5.6.2.1 Read Wait States (RWS)—Bits 15–11 The RWS field specifies the number of additional system clocks, 0-30 (31 is invalid) to delay for read access to the selected memory. The value of RWS should be set as indicated in Section 5.7.1. 5.6.2.2 Upper/Lower Byte Option (BYTE_EN)—Bits 10–9 This field specifies whether the memory is 16 bits wide or one byte wide. If the memory is byte wide, the option of upper or lower byte of a 16-bit word is selectable. Table 5-3 provides the encoding of this field. 5.6.2.3 Read/Write Enable (R/W)—Bits 8–7 This field determines the read/write capabilities of the associated memory as shown in Table 5-4. 5.6.2.4 Program/Data Space Select (PS/DS)—Bits 6–5 The mapping of a chip select to program and/or data space is shown in Table 5-5. Base + $8 - $B 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Read RWS BYTE_EN R/W PS/DS WWS Write Reset 10 11 10 00 000 10 11 1 Table 5-3. CSOR Encoding BYTE_EN Values Value Meaning 00 Disable 01 Lower Byte Enable 10 Upper Byte Enable 11 Both Bytes Enable Table 5-4. CSOR Encoding of Read/Write Values Value Meaning 00 Disable 01 Write-Only 10 Read-Only 11 Read / Write |
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