Differences
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boards:ecb:4pio-i2c:development [2021/05/20 10:19] b1ackmai1er |
boards:ecb:4pio-i2c:development [2023/02/18 23:19] (current) b1ackmai1er |
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| Line 36: | Line 36: | ||
| * Change top layer to vcc plane for better power distribution. | * Change top layer to vcc plane for better power distribution. | ||
| * Gate /WR with /CS to meet PCF8584 Z80 configuration requirements. | * Gate /WR with /CS to meet PCF8584 Z80 configuration requirements. | ||
| - | * Version C committed including above changes | + | * Version C committed including above changes. |
| + | * Patches to version B board | ||
| + | * Lift pin 1 IC15, connect lifted pin to pin 19 IC13 | ||
| + | * Lift pin 18 IC16, connect lifted pin 18 to pin 20 | ||
| + | * Lift pin 5 IC 7, connect pin 6 to pin 15 | ||
| + | * On solder side connect pin 19 IC13 to pin 2 IC2 | ||
| + | * On component side, cut track between IC16 pin 17 and IC13 pin 19. | ||
| * 4PIO-I2Cd | * 4PIO-I2Cd | ||
| * Component placement, routing changes. | * Component placement, routing changes. | ||
| * Initial ROMWBW HBIOS support. | * Initial ROMWBW HBIOS support. | ||
| * Add jumper to connect DS1307 battery backup to backplane battery backup. | * Add jumper to connect DS1307 battery backup to backplane battery backup. | ||
| + | * Add support for 3.3v I2C peripherals using logic level translator. | ||
| ====== Board ====== | ====== Board ====== | ||
| Line 46: | Line 53: | ||
| Kicad files can be found [[https:// | Kicad files can be found [[https:// | ||
| - | Current revision is ECB-4PIO-I2Cc | + | Current revision is ECB-4PIO-I2Cd |
| ====== Pictures ====== | ====== Pictures ====== | ||
| Line 108: | Line 115: | ||
| ^WRITE|11010001 (D1)| | ^WRITE|11010001 (D1)| | ||
| - | {{: | + | {{: |
| A PCF8574 I2C 8-bit I/O expander is commonly used to driver LCD displays. | A PCF8574 I2C 8-bit I/O expander is commonly used to driver LCD displays. | ||
| Line 123: | Line 130: | ||
| __ROMWBW __ | __ROMWBW __ | ||
| - | |||
| < | < | ||
| + | |||
| RomWBW HBIOS v3.1.1-pre.75, | RomWBW HBIOS v3.1.1-pre.75, | ||
| Line 144: | Line 151: | ||
| PPIDE: IO=0x20 PPI NOT PRESENT | PPIDE: IO=0x20 PPI NOT PRESENT | ||
| PPIDE: IO=0x44 PPI NOT PRESENT | PPIDE: IO=0x44 PPI NOT PRESENT | ||
| + | |||
| </ | </ | ||
| Line 153: | Line 161: | ||
| H>rtchb | H>rtchb | ||
| 01/01/21 00:03:19 | 01/01/21 00:03:19 | ||
| + | |||
| </ | </ | ||
| Line 160: | Line 169: | ||
| H>rtcds7 | H>rtcds7 | ||
| 01/01/21 00:03:35 | 01/01/21 00:03:35 | ||
| + | |||
| </ | </ | ||
| Line 177: | Line 187: | ||
| 60: -- -- -- -- -- -- -- -- 68 -- -- -- -- -- -- -- | 60: -- -- -- -- -- -- -- -- 68 -- -- -- -- -- -- -- | ||
| 70: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- | 70: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- | ||
| + | |||
| </ | </ | ||
| Line 200: | Line 211: | ||
| * Do a hard reset between each software test to ensure consistent results. Exiting in a known state is important. | * Do a hard reset between each software test to ensure consistent results. Exiting in a known state is important. | ||
| * Software control of hard reset is desirable as soft reset does guarantee consistent results. | * Software control of hard reset is desirable as soft reset does guarantee consistent results. | ||
| - | |||
| - | \\ | ||
