Philips DVDR725H, Руководство по обслуживанию

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Circuit-, IC descriptions and list of abbreviations
EN 189 HDRW720/0x, DVDR725H/0x 9.
Pin Functions
Pin Name Pin Number I/O Function
SDRAM contro l
MA [11..0]
115, 114, 143-149,
111-113
OA ddress Bus to SDRAM
MD [15..0]
132-137, 139-140,
121, 123-129
I/O Data Bus to SDRAM
MCLK 142 O Clock to SDRAM
MCS 116 O Chip Select to SDRAM
MRAS 117 O Row Address Strobe to SDRAM
MCAS 118 O Column Address Strobe to SDRAM
MWE 119 OW rite Enable to SDRAM
MLDQM 120 OL ower Data Input / Output Mask to SDRAM
MUDQM1 41 OU pper Data Input / Output Mask to SDRAM
CPU interface
RESCPU 58 OC PU reset signal
SH/68K 62 IC PU Bus mode selection
PCLK 199 O Clock to CPU
LDS/WRL 197 I
68EC000 mode: Lower Data Strobe
SH mode: Low Write strobe
UDS/WRH 198 I
68EC000 mode: Upper Data Strobe
SH mode: High Write strobe
RW/RD 196 I
68EC000 mode: Read/Write strobe
SH mode: Read strobe
DTACK/WAIT 201 O
68EC000 mode: Data Transfer Acknowledge
SH mode: WAIT
IPL[2..0] 19-17 OI nterrupt Privilege Level
IRQACK 57 I
68EC000 mode: interrupt acknowledge
†
SH mode: IRQOUT from CPU
PA23/CS 21 I
68EC000 mode: Address pin 23
SH mode: Chip Select input
PA[22..1]
22-25,28-30,39-
50,54-56
IC PU address bus (SH mode use UPA[21..1] only)
PD[15..0]1 6-12, 7-3, 207-202 I/O CPU data bus
Flash/ROM control
FOE5 9O Output Enable to Flash memory / ROM
FWE 60 OW rite Enable to Flash memory
Video signal
CSI 169 Ic omposite sync input
HSI1 68 IH sync input
†
Interrupt acknowledge is derived from the logical combination of the Function Code FC0, FC1, FC2 of 68EC000.