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| 型號： | PCD6003 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Digital telephone answering machine chip |
| 中文描述： | 數(shù)字電話應(yīng)答機(jī)芯片 |
| 文件頁數(shù)： | 59/96頁 |
| 文件大?。?/td> | 385K |
| 代理商： | PCD6003 |
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2001 Apr 17
59
Philips Semiconductors
Product specification
Digital telephone answering machine chip
PCD6003
12.1.5
DTAM
EXTERNAL MEMORY USING
DRAM
OR
ARAM
A standard DRAM or ARAM memory can be connected to the PCD6003 chip as shown in Fig.27. When WR/RD are not
programmed as push-pull outputs, a 1 k
pull-up resistor has to be connected to V
DD3V
.
handbook, full pagewidth
MBL277
WE
OE
CASN
D[3:0]
A[11:0]
RASN
WR
RD
P3.x
P0[3:0]
MA[7:0]
P2[3:0]
P3.y
PCD6003
ARAM
DRAM
Fig.27 DRAM/ARAM memory connection.
12.2
DTAM external interface during target
debugging
If the DTAM chip is used with the tScope-51 target debug
tool the DTAM chip needs executable SRAM where the
monitorprogramMON51canstoretheprogramcode.This
SRAM is accessible by means of the RD, WR and PSEN
signals. Since connection to parallel flash memory with
XSRAM and ROM is the worst case situation this case is
shown in Fig.28. Since it is not a commercial system
additional logic can be connected to the DTAM chip to
create executable SRAM.
The target debug logic only consists of combinational
logic:
CENROM
←
P2.7, P2.6 or P2.5
CENFLASH
←
P4.3
CENXSRAM
←
(PSEN or not CENROM) and (RD or
not CENFLASH)
OENXSRAM
←
PSEN and RD
WRXSRAM
←
WR.
The port restore logic is necessary to make the MA/P2/P0
ports available for the application.
The MON51 program is assumed to be in the lowest
8 kbytes of the ROM. If the flash memory should be
accessed clear P4.3 to logic 0. Now the MON51 program
has no access to the XSRAM with RD so no breakpoints
are allowed in the code area where P4.3 is logic 0. Set
P4.3 to logic 1 again after the flash memory access to
enable MON51 again to access the XSRAM.
Target debugging requires I
2
C-bus and one general
purpose input port. This means that at least 31 I/O ports
are available for the application (not using parallel flash)
during target debugging.
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| PCD6003U | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital telephone answering machine chip |
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