Block Description - Nokia 9000i Service Manual

RAE/RAK–1N
PDA Hardware
Table 17. External Signals and Connections, Outputs
Signal Name
5VPDX 5V regulator powerdown
XPWRON Power key (active low)
RBUSRXD RBUS receive of CMT (CMT <– PDA)
RSTXD Serial data from PROCU module
RSENX RS buffer enable
RSSHDX RS buffer shutdown
IRSHD IR tranceiver shutdown
JTAGTDO JTAG data out
BUZZEROUT Buzzer signal to buzzer on SIM module
LP PDA LCD Line Pulse
PCLK PDA LCD Pixel Clock
FP PDA LCD Frame Pulse
LCDD(3:0) PDA LCD Data
DISPON PDA display on control signal
KEYD(2:0) Keymatrix drive lines

Block description

– PROCU Memories
Two types of memory is used: DRAM, and FLASH (ROM). The E3G CPU
has a 22 bits (26 bit internal) wide external address bus A(21:0) and an
16–bit data bus. The address bits A(25:11) are used for chip select
decoding. The decoding is done internally on the E3G CPU.
PROCU memory map is illustrated in figures 1 and 2 and in Table 31
DRAM (70 ns) is refreshed only when main battery is connected. As long
as the main battery has power and is connected all the DRAM data stays
valid. When the main battery is removed all the DRAM data is lost.
All application data is saved to nonvolatile FLASH memory under control
of flash file system (TFFS by M–Systems). Application status is not stored.
Page 6 – 26
Signal description
After Sales
Technical Documentation
(continued)
To
PDAPWRU
B2B /
XPOWER-
ON,
LCMCON /
LCMXPOW-
ERON
B2B /
RBUSRXD
SIRU
SIRU
SIRU
SIRU
Test pad
E103
B2B /
BUZZER-
OUT
EMIU
EMIU
EMIU
EMIU
EMIU
EMIU
Original, 08/96