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MEC1632 Datasheet(PDF) 202 Page - Microchip Technology

Part # MEC1632
Description  Low Power 32-Bit Mobile Embedded Controller
PDF  636 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MEC1632 Datasheet(HTML) 202 Page - Microchip Technology

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MEC1632
DS00001592B-page 202
 2012-2018 Microchip Technology Inc.
Note 10-11
Host Commands (FF, FE, & D1) do not cause IBF. The method of blocking IBF in Figure 10-2 is the
nIOW not being asserted when FF, FE, & D1 Host commands are written”.
The hardware GATEA20 state machine returns to state S1 from state S2 when CMD = D1 (Figure 10-3).
FIGURE 10-2:
GATEA20 IMPLEMENTATION DIAGRAM
Q
Q
SET
CLR
D
Q
Q
SET
CLR
D
Q
Q
SET
CLR
D
Q
Q
SET
CLR
D
SAEN
64&AEN#
Data
AEN#&60
Address
Q
Q
SET
CLR
D
Q
Q
SET
CLR
D
SETGA20L Reg (Any WR)
RSTGA20L Reg (Any WR)
24MHz
IOW#
AEN#&64
GATEA20 Reg WR (D0)
GATEA20 Reg RD (D0)
CPU RESET
SD[7:0] = FE
SD[7:0] = FF
SD[7:0] = D1
IOW#
nIOW
nIOW
nIOW
IOW#
AEN#&60
KRESET Gen
IBF
ENAB P92
Port 92 Reg (D1)
GATEA20
VCC
VCC



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