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HD6432351 Datasheet(PDF) 184 Page - Renesas Technology Corp |
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HD6432351 Datasheet(HTML) 184 Page - Renesas Technology Corp |
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184 / 1025 page  Section 6 Bus Controller Rev. 3.00 Sep 15, 2006 page 150 of 988 REJ09B0330-0300 6.4.3 Valid Strobes Table 6.4 shows the data buses used and valid strobes for the access spaces. In a read, the RD signal is valid without discrimination between the upper and lower halves of the data bus. In a write, the HWR signal is valid for the upper half of the data bus, and the LWR signal for the lower half. Table 6.4 Data Buses Used and Valid Strobes Area Access Size Read/ Write Address Valid Strobe Upper Data Bus (D15 to D8) Lower data bus (D7 to D0) Byte Read — RD Valid Invalid 8-bit access space Write — HWR Hi-Z Byte Read Even RD Valid Invalid 16-bit access space Odd Invalid Valid Write Even HWR Valid Hi-Z Odd LWR Hi-Z Valid Word Read — RD Valid Valid Write — HWR, LWR Valid Valid Notes: Hi-Z: High impedance Invalid: Input state; input value is ignored. |
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