Copyright © Siemens AG 2016. All rights reserved
371
ERTEC 200P-2 Manual
Technical data subject to change
Version 1.0
these special IO buffers depends on the IO voltage and can be configured in the SCRB
registers DRIVE_EMC and DRIVExx_yyGPIO.
The
pull properties
of the EMC interface and GPIO31..0 und GPIO95..32 block signal
pads can also be set in the SCRB register PULLxx_yyGPIO.
2.3.10.9.15.1 Driver Power (DRIVE)
The following registers are used to set the driver power of the outputs (see 2.3.10.9.22):
DRIVE_EMC:
Contains all EMC interface signal pads, divided into signal
groups G1 – G11 (see register); settings for 1.8 V possible
DRIVE15_0GPIO: Contains the GPIO15..0 pads; settings only possible for
3.3 V
DRIVE31_15GPIO: Contains the GPIO31..15 pads; settings only possible for 3.3 V
DRIVE47_32GPIO: Contains the GPIO47..32 pads; settings for 1.8 V/3.3 V possi-
ble
DRIVE63_48GPIO: Contains the GPIO63..48 pads; settings for 1.8 V/3.3 V possi-
ble
DRIVE79_64GPIO: Contains the GPIO79..64 pads; settings for 1.8 V/3.3 V possi-
ble
DRIVE95_80GPIO: Contains the GPIO95..80 pads; settings for 1.8 V/3.3 V possi-
ble
The following combinations can be set for each GPIO pad / signal group (EMC for 1.8 V
only; GPIO31:0 for 3.3 V only; GPIO95:32 for 1.8 V / 3.3 V). Following a PowerOn reset,
the driver power is by default set to:
6 mA for GPIO31..0 pads at 3.3 V
9 mA for GPIO95..32/XHIF
pads at 3.3 V
4 mA for GPIO95..32/XHIF
pads at 1.8 V
12 mA for EMC pads at 1.8 V
For the 1.8 V XHIF interface, the external host may need to increase the driver power to
9 mA before it executes the first instance of read access. 4 mA is ok for the XHIF_XRDY
pad, as the connection is a simple point-to-point one. The alternative functions (trace
port, ext. PHY port, ...) are operated at 3.3 V.
Following a reset, the driver power settings in the registers are preassigned. The settings can be changed
by the SW at any time.
2.3.10.9.15.2 Pull setting (PULL)
The following registers are used to set the pull for the inputs (see 2.3.10.9.22):
Coding
GPIO31..0
(3.3 V)
GPIO96..32 / XHIF
EMC
(1.8 V)
(3.3 V)
(1.8 V)
00b
4 mA
6 mA
3 mA (not used)
4 mA
01b
6 mA (de-
fault)
9 mA (default)
4 mA
(default)
6 mA
10b
8 mA
18 mA (not used)
9 mA
8 mA
11b
12 mA
24 mA (not used)
12 mA
12 mA (de-
fault)