Audio And Power Section; Figure 4-3. Patriot Eim And Memory Block Diagram - Motorola ASTRO XTS 5000 Detailed Service Manual

4-16
Several other active-low control pins determine what mode the Flash memory is in: the address valid
pin ADV (ADV test point) that is connected to the EIM LBA_N signal, the output enable pin EN_OE
that is connected to the EIM OE_N signal, and the write enable pin EN_WE that is connected to the
EIM EB1_N signal. For read mode, the ADV and EN_OE pins are asserted while the EN_WE pin is
not asserted. When the EN_WE is asserted and the EN_OE pin is unasserted, the Flash operates in
the write mode.
Figure 4-3 illustrates the EIM and memory ICs block diagram.
Patriot
U401
4.3.3

Audio and Power Section

The audio and power section contains the following components:
• GCAP II IC U501
• 5-volt regulator U505
• Audio pre-amplifier U502
• Audio power amplifier U503
• EEPOT U509.
See Figure 9-16. VOCON Audio and DC Circuits on page 9-22
discussion.
April 15, 2002
RESET_OUT 3V to 1.8V
LBA_N
CS0_N
EB1_N
OE_N
A(23:0)
D(15:0)
EB0_N
CS2_N
RW_N

Figure 4-3. Patriot EIM and Memory Block Diagram

Detailed Theory of Operation
RESET
ADV
ADV
CSO
EN_CE
EN_WE
EN_OE
A(23:1)
A(22:0)
D(15:0)
A(19:1)
A(18:0)
D(15:0)
EN_OE
LB
UB
CS2
CS1
R_W
EN_WE
for schematic details of the following
: VOCON Board
Flash
U402
SRAM
U403
MAEPF-27414-O
68P81094C31-O