io31ctrl

         HPS Pinmux Control Value


Module Instance	Base Address	Register Address
`i_dedio_pinmux__pinmux_csr__10d13000__csr__SEG_L4_SHR_IOManager_0x0_0x1000`	`0x10D13000`	`0x10D1320C`

Size: 32

Offset: 0x20C

Access: RW

Important: The value of a reserved bit must be maintained in software. When you modify registers containing reserved bit fields, you must use a read-modify-write operation to preserve state and prevent indeterminate system behavior.


Bit Fields
31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16
`Reserved_7` `RO 0x0`
15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
`Reserved_7` `RO 0x0`						`iodt_config` `RW 0x0`	`iodt_en` `RW 0x0`	`iwkpullctrl` `RW 0x1`			`ihysen` `RW 0x1`	`ioden` `RW 0x0`	`islewctrl` `RW 0x1`	`idrvctrl` `RW 0x0`

io31ctrl Fields

Bit Name Description Access Reset

31:10

Reserved_7

Reserved bitfield added by Magillem

RO

0x0

iodt_config

Control bit to select NMOS or PMOS for On-die termination. Here the On-die termination impedance can be pull up or pull down based on iwkpullctrl settings

Value	Description
0	Selects NMOS ODT
1	Selects PMOS ODT

RW

0x0

iodt_en

Control bit to turn on On-die termination. Its an active high signal i.e. when set to '1' it enables On-die termination. By default this bit is set to '0'

Value	Description
0	Disables On Die Termination
1	Enables On Die Termination

RW

0x0

7:5

iwkpullctrl

Weak pull up or pull down select bits for 3 flavors of pull up or pull down resistors  i.e. 20 KOhm, 50 KOhm and 80 KOhm. User can select no pull up/down by setting this 3 bit field either to 000 or 111.
Weak pull up or pull down select bits for 3 flavors of pull up or pull down resistors  i.e. 20 KOhm, 50 KOhm and 80 KOhm. User can select no pull up/down by setting this 3 bit field either to 000 or 111

Value	Description
0	No pull up and down
1	Weak Pull up for 20Kohm
2	Weak Pull up for 50Kohm
3	Weak Pull up for 80Kohm
4	Weak Pull down for 20Kohm
5	Weak Pull down for 50Kohm
6	Weak Pull down for 80Kohm

RW

0x1

ihysen

Control bit to select between TTL and schmitt trigger. By default schmitt trigger is selected.  0 - No hysteresis or TTL .  1- 200 mv of hysteresis i.e. receiving buffer will select schmitt trigger.

Value	Description
0	TTL or no hysteresis
1	Schmitt

RW

0x1

ioden

Selects between open drain or normal drive mode. By default, normal drive mode is selected.

Value	Description
0	Normal drive mode
1	Open drain drive mode

RW

0x0

islewctrl

Control bit to select fast or slow slew rate.The default setting is fast slew for 8mA of drive. This bit can be set to '0' to select slow slew.�

Value	Description
0	Slow Slew Rate
1	Fast Slew rate

RW

0x1

1:0

idrvctrl

Selects pull up or pull down drive strength. The default settings select 8mA. These 2 bits can be used to select� 2mA , 4mA, 6 mA or 8 mA of drive strength

Value	Description
0	Drive Strength for 8mA
1	Drive Strength for 2mA
2	Drive Strength for 4mA
3	Drive Strength for 6mA

RW

0x0