diff --git a/verilog/dv/randsack_netlists.v b/verilog/dv/randsack_netlists.v
index e61d22a..6585946 100644
--- a/verilog/dv/randsack_netlists.v
+++ b/verilog/dv/randsack_netlists.v
@@ -33,7 +33,8 @@
     `include "collapsering_macro.v"
     `include "ringosc_macro.v"
     `include "ring_control.v"
+    `include "pwm_wb.v"
     `include "picorv32_wb/gpio32_wb.v"
     `include "picorv32_wb/simpleuart_div16_wb.v"
-    `include "verilog-wishbone/rtl/wb_mux_4.v"
+    `include "verilog-wishbone/rtl/wb_mux_8.v"
 `endif
diff --git a/verilog/dv/randsack_regrw_directed/randsack_regrw_directed.c b/verilog/dv/randsack_regrw_directed/randsack_regrw_directed.c
index ace6adf..a820b17 100644
--- a/verilog/dv/randsack_regrw_directed/randsack_regrw_directed.c
+++ b/verilog/dv/randsack_regrw_directed/randsack_regrw_directed.c
@@ -23,15 +23,23 @@
 
 #define RANDSACK_GPIO0_BASE 0x30800000
 #define RANDSACK_PWM0_BASE  0x30810000
+#define RANDSACK_PWM1_BASE  0x30810100
+#define RANDSACK_PWM2_BASE  0x30810200
+#define RANDSACK_PWM3_BASE  0x30810300
 #define RANDSACK_UART0_BASE 0x30820000
 #define RANDSACK_RING0_BASE 0x30830000
-#define RANDSACK_RING1_BASE 0x30840000
+#define RANDSACK_RING1_BASE 0x30830100
 
 #define RANDSACK_GPIO_DATA  0x00
 #define RANDSACK_GPIO_ENA   0x04
 #define RANDSACK_GPIO_PU    0x08
 #define RANDSACK_GPIO_PD    0x0c
 
+#define RANDSACK_PWM_DIV    0x00
+#define RANDSACK_PWM_CNTMAX 0x04
+#define RANDSACK_PWM_CNT    0x08
+#define RANDSACK_PWM_CMP    0x0c
+
 #define RANDSACK_RING_COUNT_ADDR    0x00
 #define RANDSACK_RING_CONTROL_ADDR  0x04
 #define RANDSACK_RING_TRIMA_ADDR    0x08
@@ -95,10 +103,24 @@
   while (reg_mprj_xfer == 1)
     ;
 
-  // Enable GPIOs and write pattern.
-  REG(RANDSACK_GPIO0_BASE + RANDSACK_GPIO_ENA) = 0x0000ffff;
+  // Enable GPIOs and PWM IOs and write pattern.
+  REG(RANDSACK_GPIO0_BASE + RANDSACK_GPIO_ENA) = 0x0000ffff | (1 << 23) | (1 << 21) | (1 << 19) | (1 << 17);
   REG(RANDSACK_GPIO0_BASE + RANDSACK_GPIO_DATA) = 0x00005555;
 
+  // Configure PWMs.
+  REG(RANDSACK_PWM0_BASE + RANDSACK_PWM_DIV) = 1;
+  REG(RANDSACK_PWM0_BASE + RANDSACK_PWM_CNTMAX) = 255;
+  REG(RANDSACK_PWM0_BASE + RANDSACK_PWM_CMP) = 128;
+  REG(RANDSACK_PWM1_BASE + RANDSACK_PWM_DIV) = 2;
+  REG(RANDSACK_PWM1_BASE + RANDSACK_PWM_CNTMAX) = 255;
+  REG(RANDSACK_PWM1_BASE + RANDSACK_PWM_CMP) = 64;
+  REG(RANDSACK_PWM2_BASE + RANDSACK_PWM_DIV) = 3;
+  REG(RANDSACK_PWM2_BASE + RANDSACK_PWM_CNTMAX) = 64;
+  REG(RANDSACK_PWM2_BASE + RANDSACK_PWM_CMP) = 32;
+  REG(RANDSACK_PWM3_BASE + RANDSACK_PWM_DIV) = 4;
+  REG(RANDSACK_PWM3_BASE + RANDSACK_PWM_CNTMAX) = 127;
+  REG(RANDSACK_PWM3_BASE + RANDSACK_PWM_CMP) = 64;
+
   // Reset ring1 osc.
   REG(RANDSACK_RING1_BASE + RANDSACK_RING_TRIMA_ADDR) = 50;
   REG(RANDSACK_RING1_BASE + RANDSACK_RING_CONTROL_ADDR) = RANDSACK_RING_CONTROL_START_MASK + RANDSACK_RING_CONTROL_TEST_EN_MASK;